Core Python Programming (2nd Edition)

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= • • • • • • • • • == • • • • • • • • • != • • • • • • • • • • • • • • • • • • is • • • • • • • • • is not • • • • • • • • • in • • • • not in • • • • not • • • • • • • • • and • • • • • • • • • or • • • • • • • • • [a] May also include corresponding augmented assignment operators. [b] Operations involving Boolean types will be performed on the operands as ints. [c] (Both) set types new in Python 2.4.
Appendix 3. About the Author Wesley Chun was initiated into the world of computing in high school. There he learned BASIC and 6502 Assembly on Commodore PET/CBM systems, Pascal on the Apple IIe, and FORTRAN on punch cards. He also helped the journalism department convert from typewriters to CP/M-based Osborne 1s running MicroPro WordStar and served as a student-instructor teaching BASIC programming to 4th, 5th, and 6th graders, and their parents. Wesley then went on to the University of California, Berkeley, as a California Alumni Scholar. He nearly completed a triple major, finally graduating with an A.B. in applied math (computer science) and a minor in music (classical piano). While at Cal he coded in Pascal, Logo, and C. One of his summer internships involved programming in a 4GL and writing an entire "Getting Started" user manual. Also at Cal, he took a course on tutoring undergraduates that featured videotape training and psychological counseling. Several years later at the University of California, Santa Barbara, Wesley continued his studies in computer science (networking) and taught C programming for UCSB Extension. A paper based on his master's thesis was nominated for the Best Paper award at the 29th HICSS conference and a later version appeared in the University of Singapore's Journal of High Performance Computing. After graduation, Wesley went on to Sun Microsystems where he worked on the Solaris operating system. He also continued to teach for UC Extension, this time for the Santa Cruz campus in Silicon Valley, instructing courses in Unix and C (and later, Python). When the Internet finally went mainstream, he joined a start-up named Four11 (later acquired by Yahoo!) where he was exposed to Python. He was on the Yahoo!Mail development team, rearchitecting the original spellchecker and address book, and was also the lead engineer for Yahoo! People Search. After leaving Yahoo!, he wrote the first edition of this book, then traveled around the world. He then came back to do something (almost) completely different for Synarc: spinal fracture radiology software for doctors in a clinical trials setting. Then he went to IronPort to help keep spam and viruses out of your inbox. Wesley is now an independent Python consultant and technical trainer (www.cyberwebconsulting.com). In his spare time, his non-computer-related hobbies include: bowling, basketball, bicycling, yoga, ultimate frisbee, playing poker online and with friends, traveling, playing the piano, and spending time with his wife and kids. He is a coordinator for the Silicon Valley-San Francisco Bay Area Python users group (www.baypiggies.net) and a volunteer for the Python Tutor mailing list. He is also responsible for creating and maintaining the online "Monster Discography" for musical artists, including, The Alan Parsons Project, Alan Parsons (solo band), Eric Woolfson (and his projects), and Andrew Powell and the Philharmonia Orchestra. (If you think you're a fan but don't have Freudiana, you had better find it.)
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Table of Contents | Index Core Pyth
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The Complete Developer's Guide to P
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Table of Contents | Index Copyright
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Section 6.2. Strings Section 6.3. S
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Section 11.5. Formal Arguments Sect
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Section 19.4. Brief Tour of Other G
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Copyright Many of the designations
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Praise for Core Python Programming
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Prentice Hall Core Series Core J2EE
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Another set of first edition reader
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We will continue to update the book
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Dictionaries are Python's mapping o
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and you will find it fun! We first
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Acknowledgments Acknowledgments for
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Christian Tismer (creator of Stackl
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Chapter 1. Welcome to Python! Chapt
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1.2. Origins Work on Python began i
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which you can build an application,
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often provides an extended distract
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Build It Yourself For most other pl
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Windows/DOS To add Python to your s
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It is also possible in Unix to auto
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MacOS X is very Unix-like (based on
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Figure 1-5. Starting IDLE in Window
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1.6. Python Documentation Python do
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orrow features from languages such
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1.8. Other Implementations The "sta
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1.9. Exercises 1-1. Python Installa
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abs(4) 4 >>> abs(-4) 4 We will intr
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%s means to substitute a string whi
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It's very tempting for beginners to
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2.4. Operators The standard mathema
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2.5. Variables and Assignment Rules
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All numeric types are covered in Ch
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2.8. Lists and Tuples Lists and tup
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2.10. Code Blocks Use Indentation C
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2.12. while Loop The standard while
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Using the string format operator al
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2.14. List Comprehensions These are
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case you would have to revert back
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2.17. Functions Like many other lan
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2.18. Classes Classes are a core pa
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2.19. Modules A module is a logical
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2.20. Useful Functions In this chap
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2-4. User Input with raw_input(). a
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put in your own as you write your c
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Chapter 3. Python Basics Chapter To
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3.1.3. Multiple Statement Groups as
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3.2. Variable Assignment This secti
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Another way of assigning multiple v
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[a] access keyword obsoleted as of
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three PEPs: 7 (Style Guide for C Co
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3. Module imports Import all the mo
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Tests in the main body are an easy
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As responsible programmers, we are
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● It is explicitly removed from a
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Lines 13 The Unix startup line is f
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1 #!/usr/bin/env python 2 3 'readTe
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3.7. Related Modules/Developer Tool
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3-10. Exceptions. Replace the call
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4.1. Python Objects Python uses the
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4.3. Other Built-in Types ● Type
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4.4. Internal Types ● Code ● Fr
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4.5. Standard Type Operators 4.5.1.
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Example 2: foo1 and foo2 reference
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4.5.3. Boolean In the above example
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4.6. Standard Type Built-in Functio
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str(2e10) '20000000000.0' >>> >>> s
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>>> type(foo) # assumes foo instant
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then we do not even need to check b
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4.7. Type Factory Functions Since P
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Another way of categorizing the sta
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Sequence types are those whose elem
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4.10. Exercises 4-1. Python Objects
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Chapter 5. Numbers Chapter Topics
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Okay, now that you have a good idea
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Core Style: Use uppercase "L" with
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5.3. Double Precision Floating Poin
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aComplex.real -8.333 >>> aComplex.i
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Automatic numeric coercion makes li
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True Division This is where divisio
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see that the unary operator binds m
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Bitwise Operator Function ~num (una
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In addition, because of the unifica
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divmod(10,2.5) (4.0, 0.0) >>> divmo
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floor(-1.2) -2.0 round(-1.2) -1.0 -
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5.7. Other Numeric Types 5.7.1. Boo
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cannot "be continued." If we were t
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uniform() Does almost the same thin
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5.9. Exercises The exercises in thi
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Why do we get 134L and not 1342 in
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Chapter 6. Sequences: Strings, List
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obj not in seq Tests if obj is not
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if not provided, or if None is used
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Extended Slicing with Stride Indice
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above. 6.1.3. Built-in Functions (B
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[a] New in Python 2.3. [b] key argu
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considered a substring. To access s
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6.3. Strings and Operators 6.3.1. S
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Notice how the omission of both ind
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numeric identifier strings that we
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method (see example below). There i
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6.4. String-Only Operators 6.4.1. F
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'6c' >>> >>> "%X" % 108 '6C' >>> >>
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>>> print s.substitute(lang='Python
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6.5. Built-in Functions 6.5.1. Stan
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isinstance() calls to verify type:
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string.isalpha() [a] , [b] [c] Retu
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>>> quest.endswith('color?') True >
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\t 011 9 0x09 HT Horizontal tab \n
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string was created when the operati
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convert the numeric value of the by
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Example 6.2. Simple Unicode String
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Mistake #2: Using the string module
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6.9. Related Modules Table 6.10 lis
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6.10. Summary of String Highlights
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How to Update Lists You can update
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str_list[2] 'over' >>> str_list[:2]
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Traceback (innermost last): File ""
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3. 4. 5. If elements are of the sam
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sum(a, 5) 20 >>> a = [6., 4., 5.] >
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[a] Removes and returns obj at give
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original list object is left as is,
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28 while True: 29 while True: 30 tr
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(Q)uit Enter choice: v You picked:
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Line-by-Line Explanation Because of
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6.16. Tuples Tuples are another con
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6.17. Tuple Operators and Built-in
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6.18. Special Features of Tuples 6.
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(4, True, 5) >>> (4, 2) < (3, 5) #
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6.19. Related Modules Table 6.12 li
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[id(x) for x in hubby] [9919616, 11
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6.21. Summary of Sequences Sequence
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str() • • • strip() • swapc
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d. Take a string and append a backw
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6-12. Strings. a. b. c. Create a fu
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6-19. Multi-Column Output. Given an
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7.1. Mapping Type: Dictionaries Dic
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dict2 = {'name': 'earth', 'port': 8
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dict2['arch'] = 'sunos5' # add new
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Beginning with Python 2.2, programm
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size, their keys match, and so do t
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dict(zip(('x', 'y'), (1, 2))) {'y':
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7.4. Mapping Type Built-in Methods
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dict2= {'host':'earth', 'port':80}
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7.5. Dictionary Keys Dictionary val
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39 try: 40 choice = raw_input(promp
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7.6. Set Types In mathematics, a se
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... print i ... c e h o p s How to
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superset of the second set (is a su
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s &= set('shop') >>> s set(['h', 's
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7.9. Set Type Built-in Methods 7.9.
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7.10. Operator, Function/Method Sum
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7.11. Related Modules The sets modu
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7-5. userpw2.py. The following prob
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characters in srcstr that are beyon
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Chapter 8. Conditionals and Loops C
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8.2. else Statement Like other lang
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8.3. elif (aka else-if) Statement e
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8.4. Conditional Expressions (aka "
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One must use caution when using whi
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Iterating by Sequence Item >>> name
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ange(start, end, step=1) range() wi
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are "sequence-related" is that half
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8.8. continue Statement Core Note:
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8.10. else Statement ... Take Two I
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8.11. Iterators and the iter() Func
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Dictionaries Dictionaries and files
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8.12. List Comprehensions List comp
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and split each line up into words,
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of building up this long list, it w
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lines)? That way, we can use the ma
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8.15. Exercises 8-1. Conditionals.
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8-9. Fibonacci Numbers. The Fibonac
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Chapter 9. Files and Input/Output C
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9.2. File Built-in Functions [open(
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you see references to open(), you c
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Note that there is no "writeline()"
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We originally described how this pr
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f.seek(-12, 1) # move back 12 bytes
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9.4. File Built-in Attributes File
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9.6. Command-Line Arguments The sys
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9.7. File System Access to your fil
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Separation basename() Remove direct
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53 print '*** deleting test file' 5
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to confirm that the directory is in
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9.8. File Execution Whether we want
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other external extension modules th
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9.10. Related Modules There are ple
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Some other Python modules that gene
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9-10. Home Finances. Create a home
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9-15. Copying Files. Prompt for two
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9-24. File Transfer Between Archive
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10.1. What Are Exceptions? 10.1.1.
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10.2. Exceptions in Python As you w
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our case with the foo (non-)attribu
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As you can see, our code now runs s
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etval = None return retval Bear in
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except (Exc1[, Exc2[, ... ExcN]])[,
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except Exception, e: # handle real
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try: ... float(['float() does not',
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13 log = open('cardlog.txt', 'w') 1
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determine whether there were defect
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log.write('no txns this month\n') f
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10.4. Context Management 10.4.1. wi
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Now the with_suite executes. When e
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10.6. Raising Exceptions The interp
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aise string, args, tb Same as above
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try: assert 1 == 0, 'One does not e
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[d] Error in FloatingPointError flo
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[h] Unicode- UnicodeError related e
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10.9. *Creating Exceptions Although
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79 f.close() 80 81 for eachTest in
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the host's name and the port number
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10.10. Why Exceptions (Now)? There
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10.12. Exceptions and the sys Modul
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10.14. Exercises 10-1. Raising Exce
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10-9. Improving math.sqrt(). The ma
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11.1. What Are Functions? Functions
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Stated Number of Objects to Return
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Keyword arguments may also be used
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Line-by-Line Explanation Lines 14 O
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11.3. Creating Functions 11.3.1. de
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modules foo and bar, but can use th
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The main motivation behind decorato
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func = deco1(deco_arg)(deco2(func))
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11.4. Passing Functions The concept
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11.5. Formal Arguments A Python fun
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mandatory, whereas default argument
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11.6. Variable-Length Arguments The
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formal arg1: 1220 formal arg2: 740.
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We will leave a timeit() function a
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11.7. Functional Programming Python
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a(0,9) 9 >>> >>> b = lambda *z: z >
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In Figure 11-1, we observe our orig
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consisting of all the return values
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sequences together. This idiom was
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print 'the total is:', reduce((lamb
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some of those arguments, such as ma
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11.8. Variable Scope The scope of a
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print is_this_global def 11.8.3. Nu
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count2 = counter(100) >>> print cou
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For example, let us assume that fun
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name, e.g., post_logged() will log
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variable. Beginning in 2.1, the ent
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11.9. *Recursion A function is recu
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Now that we have our generator func
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count.next() 5 >>> count.next() 6 >
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11-3. Functions. In this exercise,
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11-14. *Recursion. We also looked a
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12.1. What Are Modules? A module al
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definitely vary as you go from syst
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Notice that each of the namespaces
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You will see just how useful they a
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It is possible to import specific m
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12.5. Features of Module Import 12.
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# impter.py # ############# import
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getting them "registered" (or rathe
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foo() We are going to ask for the d
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Furthermore, we can go down one mor
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12.8. Other Features of Modules 12.
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# overly massive handlers for the c
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12.9. Related Modules The following
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12-6. Extended Import. Create a new
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13.1. Introduction Before we get in
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class MyNewObjectType: 'define MyNe
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(We will add print statements to ou
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Each subclass must define its own c
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13.2. Object-Oriented Programming T
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interfacing with components of the
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derive; and class_suite consists of
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100 >>> C.foo = C.foo + 1 >>> print
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As you can tell, dir() returns a li
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ascertain the location of a class s
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In contrast for those of you using
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id(c1), id(c2), id(c3) # all refer
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13.6. Instance Attributes Instances
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wasWkEnd = HotelRoomCalc(119, 0.045
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The __dict__ attribute consists of
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However, we can only update the val
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As we have seen above, it is perilo
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override a parent method where you
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tcm = TestClassMethod() >>> TestCla
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13.10. Subclassing and Derivation C
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13.11. Inheritance Inheritance desc
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Now let us create the child class C
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class C(P): def __init__(self): sup
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def keys(self): return sorted(self.
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gc = GC() >>> gc.foo() # GC C1 P1 c
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class B(object): pass class C(objec
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isinstance(c2, C2) True >>> isinsta
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The super() function was added in 2
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13.13. Customizing Classes with Spe
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C.__*rshift__(self, obj) Right shif
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The Numeric Types set of special me
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We still have a few problems ... on
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The output is very nice, exactly wh
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1 #!/usr/bin/env python 2 3 class T
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from randseq import RandSeq >>> for
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Addition We define the addition ope
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[9 :: 'foofoofoo'] >>> b + e [3 ::
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which we raise in such cases. Lines
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13.15. *Delegation 13.15.1. Wrappin
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wrappedComplex.imag # imaginary att
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Creation time, modification time, a
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Wrapping a Specific Object with Enh
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13.16. Advanced Features of New-Sty
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preventing users from adding instan
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A descriptor is a class attribute,
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hide such a descriptor, just as you
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43 FileDescr.saved.remove(self.name
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If we try it out, we see that it sa
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def fget(self): return ~self.__x de
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print '*** Created class %r at: %s'
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44 __metaclass__ = ReqStrSugRepr 45
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... print '%s(%d, %d) = %d' % \ ...
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13.18. Exercises 13-1. Programming.
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cash.update(100000.4567) >>> cash 1
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13-9. Queue Class. A queue is a dat
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13-17. Subclassing Numeric Types. T
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Chapter 14. Execution Environment C
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Internally, BIFs are represented as
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__dict__ object. Later on in this c
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>>> c.foo # bound method object >>
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14.2. Code Objects Callables are a
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14.3.2. compile() compile() is a fu
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not a string representation of an i
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The above was performed with raw_in
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-----------------------------------
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A sequence was chosen; enter the se
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them into real Python objects. Othe
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import import2 And here are the con
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$ python /usr/local/lib/python2x/CG
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wait() Wait for child process to co
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As you can see, popen() returns a f
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14.5.5. subprocess Module After Pyt
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14.6. Restricted Execution At one t
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Calling sys.exit() causes the Pytho
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14.8. Miscellaneous Operating Syste
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14.9. Related Modules In Table 14.9
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14-9. Shells. Create a shell (opera
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Chapter 15. Regular Expressions Cha
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Python supports REs through the sta
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15.2. Special Symbols and Character
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"\.". 15.2.3. Matching from the Beg
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We will now introduce the most comm
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\d+(\.\d*)? Strings representing si
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match(pattern, string, flags=0) Att
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m = re.match('foo', 'foo') # patter
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15.3.7. Matching Any Single Charact
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... >>> In the above code, we creat
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Subgroup searches result in a more
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saving the output to a whodata.txt
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15.4. Regular Expressions Example W
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domain. After the final double-colo
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patt = '\d+-\d+-\d+' >>> re.search(
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15.5. Exercises Regular Expressions
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15-19. Extract the complete timesta
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16.1. Introduction 16.1.1. What Is
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The teller is, of course, the serve
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16.2. Sockets: Communication Endpoi
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word "datagram." Because these sock
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Method Description Server Socket Me
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We do not implement this in our exa
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it can immediately make a connectio
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One way to create this "friendly" e
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cs = socket() # create client socke
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[a] Socket address families support
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16.4. *SocketServer Module SocketSe
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Lines 1115 18 print 'waiting for co
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$ And here is the server's: $ tsTse
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This is a timestamp TCP server usin
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calling the write() method of the t
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16.7. Exercises 16-1. Sockets. What
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3. Add logging capability to your n
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17.1. What Are Internet Clients? Be
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3. 4. Client logs in with username
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pwd() Current working directory cwd
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31 f.quit() 32 return 33 print '***
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after-hours, using Python is a grea
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17.3.3. Python and NNTP Based on yo
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article (id) Also similar to body()
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16 except socket.gaierror, e: 17 pr
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deltas = [ x[1]-x[0] for x in parti
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17.4. Electronic Mail Electronic ma
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4. Make service request(s) Quit As
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data: (250, 'ok ; id=20051226235837
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... p.quit() Before we take a look
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any errors. Example 17.3. SMTP and
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17.5. Related Modules One of Python
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17.6. Exercises FTP 17-1. Simple FT
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E-MAIL 17-16. Threaded Newsreader.
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Miscellaneous c. d. e. - Is the mes
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Chapter 18. Multithreaded Programmi
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18.2. Threads and Processes 18.2.1.
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Those of you interested in the sour
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18.3.5. Python Threading Modules Py
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The same loops from onethr.py are e
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25 thread.start_new_thread(loop, 26
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18.5. tHReading Module We will now
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isDaemon() Return daemon flag of th
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In this example we pass in a callab
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19 print 'start loop', nloop, 'at:'
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16 def sum(x): 17 sleep(0.1) 18 if
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We use the Queue module to provide
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for random numbers!) Seriously, tho
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18.7. Exercises 18-1. Processes ver
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Chapter 19. GUI Programming Chapter
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distribution for specific instructi
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some applications use root rather t
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either from the Tkinter topics page
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Example 19.2. Button Widget Demo (t
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in the Label widget. The greater th
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PFAs fits perfectly into a situatio
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Lines 3033 These lines represent ou
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71 def doLS(self, ev=None): 72 erro
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Line-by-Line Explanation Lines 15 T
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The last pieces of code in listdir.
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Things are different once we start
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Our second example uses the Python
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Lines 537 Here we instantiate a Fra
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our primary widgets. This is exactl
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Qt/KDE-Related Modules PyQt Python
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19-9. Multithreaded Chat Applicatio
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20.1. Introduction This introductor
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As you can see from the figure, the
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net_loc can be broken down into sev
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urlunparse(urltup) Unparses a tuple
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urlretrieve(urlstr, localfile=None,
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87 if eachLink not in self.q: 88 se
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urllib Functions Description urlope
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(). This code was inspired by Mike
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parse the newly downloaded page and
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20.4. CGI: Helping Web Servers Proc
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Finally, as you can probably guess,
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This HTML file presents a form to t
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Example 20.4. Results Screen CGI co
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Both friends.html and friends1.py a
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The other reason for creating actio
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12 ERROR 13 %s 14 16 ''' 17 18 def
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link with all the existing informat
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Now the user is able to make change
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This script outputs Unicode strings
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When more than one checkbox is subm
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Figure 20-16. Submitting our advanc
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Figure 20-17. Results page generate
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This script has one main class that
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113 MAXBYTES = 1024 114 langlist =
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all the information and sends the f
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20.8. Web (HTTP) Servers Until now,
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33 main() This server subclasses Ba
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[b] Interface to the non-validating
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20.10. Exercises 20-1. urllib Modul
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20-19. Electronic Commerce Engine.
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Chapter 21. Database Programming Ch
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When you query a database, you can
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Python world. As a software enginee
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This string (not float) indicates t
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DatabaseError Database error DataEr
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callproc( func[, args]) Call a stor
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● http://python.org/topics/databa
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cur.execute("INSERT INTO users VALU
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'', None, '{pgsql=C*T*/pgsql}'] ['t
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23 24 if db == 'sqlite': 25 try: 26
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140 db = setup() 141 print '*** Con
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whereas Gadfly does not, so rows ha
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21.3. Object-Relational Managers (O
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54 def insert(self): 55 d = [dict(z
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44 def create(self): 45 Users = sel
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the rows from the database and pret
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The code works something like this:
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We hope that we have provided you w
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adodbapi http://adodbapi.sf.net Syb
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Chapter 22. Extending Python Chapte
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● Added/extra (non-Python) functi
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The following code represents our l
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usr/include/python2.x, where the "2
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} res = PyArg_ParseTuple(args, "i",
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PyArg_ParseTupleAndKeywords() with
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$ python setup.py build running bui
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1 #include 2 #include 3 #include
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after its reference count has decre
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22.3. Related Topics SWIG There is
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22.4. Exercises 22-1. Extending Pyt
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23.1. Web Services There are many W
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The field names are given in the or
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23.2. Programming Microsoft Office
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This script launches Excel and writ
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23.2.3. Microsoft Word The next dem
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Applying PowerPoint in an applicati
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This script launches Outlook, creat
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Then when you are trying to send a
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Lines 113 We import all of the attr
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23.3. Python and Java Programming w
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Example 23.8. Swing "Hello World" i
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23.4. Exercises Web Services 23-1.
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23-15. Excel Cell Formatting. In th
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23-21. Python and Jython. Find a Py
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Chapter 22 Chapter 23
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or print i, s[i] for i, x in enumer
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Chapter 4 1. Python objects All Pyt
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When i % 2 == 0, it's even (divisib
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Chapter 7 1. Dictionary methods dic
Page 1022 and 1023: Chapter 8 3. range() built-in funct
Page 1024: Chapter 10 1. Raising exceptions e)
Page 1027 and 1028: Chapter 12 2. Importing attributes
Page 1029 and 1030: Chapter 14 1. Callable objects Func
Page 1031 and 1032: 9. Python floats [0-9]+(\.[0-9]*)?
Page 1033 and 1034: Chapter 17 20. Identifiers pass is
Page 1035 and 1036: Chapter 19 1. Client/server archite
Page 1037 and 1038: Chapter 21 1. Extending Python ●
Page 1039 and 1040: Chapter 23 3. Web services and the
Page 1041 and 1042: Python Keywords Table B.1 lists Pyt
Page 1043 and 1044: [a] Boolean comparisons return eith
Page 1045 and 1046: % Modulo/remainder • • • •
Page 1047 and 1048: isnumeric() • isspace() • istit
Page 1049 and 1050: String Format Operator Conversion S
Page 1051 and 1052: - Use left justification + Use a pl
Page 1053 and 1054: string.isdigit() [b] [c] Returns tr
Page 1055 and 1056: List Type Built-in Methods In Table
Page 1057 and 1058: [c] New in Python 2.3. [d] New in P
Page 1059 and 1060: s.copy() Copy operation: return (sh
Page 1061 and 1062: [d] Encoding that this file useswhe
Page 1063 and 1064: OverflowError Calculation exceeded
Page 1065: [i] Warning about FutureWarning con
Page 1068 and 1069: [a] Get attribute; getattr() built-
Page 1070 and 1071: __radd__, or __iadd__. [f] New in P
Page 1074 and 1075: Index [SYMBOL] [A] [B] [C] [D] [E]
Page 1076 and 1077: | (pipe symbol) 2nd 3rd |= (pipe eq
Page 1078 and 1079: arguments class methods command-lin
Page 1084 and 1085: instance attributes vs. methods mod
Page 1086 and 1087: compound statements concatenation (
Page 1090 and 1091: copy( ) creating 2nd dict( ) exact
Page 1095 and 1096: sys module try statement with multi
Page 1099 and 1100: float( ) built-in function 2nd floa
Page 1101 and 1102: eturn values standard type 2nd vari
Page 1103 and 1104: grouping 2nd groups( ) method GTK+
Page 1107 and 1108: installing Python instance attribut
Page 1109 and 1110: through files iterators about any n
Page 1113 and 1114: list( ) built-in function 2nd list(
Page 1117 and 1118: for re module group(s) invoking 2nd
Page 1119 and 1120: modulus operator MRO [See method re
Page 1121 and 1122: and OOP classic classes vs. descrip
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Index [SYMBOL] [A] [B] [C] [D] [E]
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intersection update ( &= ) key-look
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PyQt PyQtGPL Pyrex Python Enhanceme
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tuple elements/tuples repetition li
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for statement used with keys for 2n
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about as original Internet protocol
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ules for suites static data static
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subtraction ( - ) operator suites 2
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definition of examples exiting glob
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categorizing standard function to c
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Universal NEWLINE Support (UNS) 2nd
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wxGlade wxPython 2nd 3rd wxWidgets
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Core Python Programming (2nd Edition)

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