Core Python Programming (2nd Edition)

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try: assert 1 == 0, 'One does not equal zero silly!' except AssertionError, args: print '%s: %s' % (args.__class__.__name__, args) Executing the above code from the command line would result in the following output: AssertionError: One does not equal zero silly! To give you a better idea of how assert works, imagine how the assert statement may be implemented in Python if written as a function. It would probably look something like this: def assert(expr, args=None): if __debug__ and not expr: raise AssertionError, args The first if statement confirms the appropriate syntax for the assert, meaning that expr should be an expression. We compare the type of expr to a real expression to verify. The second part of the function evaluates the expression and raises AssertionError, if necessary. The built-in variable __debug__ is 1 under normal circumstances, 0 when optimization is requested (command-line option -O).
10.8. Standard Exceptions Table 10.2 lists all of Python's current set of standard exceptions. All exceptions are loaded into the interpreter as built-ins so they are ready before your script starts or by the time you receive the interpreter prompt, if running interactively. Table 10.2. Python Built-In Exceptions Exception Name Description [a] Root class for BaseException all exceptions [b] Request SystemExit termination of Python interpreter [c] User KeyboardInterrupt interrupted execution (usually by typing ^C) [d] Root class for Exception regular exceptions [e] Iteration has StopIteration no further values [a] Exception sent GeneratorExit to generator to tell it to quit [h] Request SystemExit termination of Python interpreter [g] Base class for StandardError all standard built-in excep tions ArithmeticError [d] Base class for all numeric calculation errors
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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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Page 384 and 385: 9.8. File Execution Whether we want
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Page 388 and 389: 9.10. Related Modules There are ple
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Page 392 and 393: 9-10. Home Finances. Create a home
Page 394 and 395: 9-15. Copying Files. Prompt for two
Page 396 and 397: 9-24. File Transfer Between Archive
Page 398 and 399: 10.1. What Are Exceptions? 10.1.1.
Page 400 and 401: 10.2. Exceptions in Python As you w
Page 402 and 403: our case with the foo (non-)attribu
Page 404 and 405: As you can see, our code now runs s
Page 406 and 407: etval = None return retval Bear in
Page 408 and 409: except (Exc1[, Exc2[, ... ExcN]])[,
Page 410 and 411: except Exception, e: # handle real
Page 412 and 413: try: ... float(['float() does not',
Page 414 and 415: 13 log = open('cardlog.txt', 'w') 1
Page 416 and 417: determine whether there were defect
Page 418 and 419: log.write('no txns this month\n') f
Page 420 and 421: 10.4. Context Management 10.4.1. wi
Page 422 and 423: Now the with_suite executes. When e
Page 424 and 425: 10.6. Raising Exceptions The interp
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Page 434 and 435: 10.9. *Creating Exceptions Although
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Page 440 and 441: 10.10. Why Exceptions (Now)? There
Page 442 and 443: 10.12. Exceptions and the sys Modul
Page 444 and 445: 10.14. Exercises 10-1. Raising Exce
Page 446 and 447: 10-9. Improving math.sqrt(). The ma
Page 448 and 449: 11.1. What Are Functions? Functions
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Page 452 and 453: Keyword arguments may also be used
Page 454 and 455: Line-by-Line Explanation Lines 14 O
Page 456 and 457: 11.3. Creating Functions 11.3.1. de
Page 458 and 459: modules foo and bar, but can use th
Page 460 and 461: The main motivation behind decorato
Page 462 and 463: func = deco1(deco_arg)(deco2(func))
Page 464 and 465: 11.4. Passing Functions The concept
Page 466 and 467: 11.5. Formal Arguments A Python fun
Page 468 and 469: mandatory, whereas default argument
Page 471 and 472: 11.6. Variable-Length Arguments The
Page 473 and 474: formal arg1: 1220 formal arg2: 740.
Page 475 and 476: We will leave a timeit() function a
Page 477 and 478: 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
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Chapter 8 3. range() built-in funct
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Chapter 10 1. Raising exceptions e)
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Chapter 12 2. Importing attributes
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Chapter 14 1. Callable objects Func
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9. Python floats [0-9]+(\.[0-9]*)?
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Chapter 17 20. Identifiers pass is
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Chapter 19 1. Client/server archite
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Chapter 21 1. Extending Python ●
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Chapter 23 3. Web services and the
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Python Keywords Table B.1 lists Pyt
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[a] Boolean comparisons return eith
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% Modulo/remainder • • • •
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isnumeric() • isspace() • istit
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String Format Operator Conversion S
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- Use left justification + Use a pl
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string.isdigit() [b] [c] Returns tr
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List Type Built-in Methods In Table
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[c] New in Python 2.3. [d] New in P
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s.copy() Copy operation: return (sh
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[d] Encoding that this file useswhe
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OverflowError Calculation exceeded
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[i] Warning about FutureWarning con
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[a] Get attribute; getattr() built-
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__radd__, or __iadd__. [f] New in P
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= • • • • • • • •
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Index [SYMBOL] [A] [B] [C] [D] [E]
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| (pipe symbol) 2nd 3rd |= (pipe eq
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arguments class methods command-lin
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instance attributes vs. methods mod
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compound statements concatenation (
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copy( ) creating 2nd dict( ) exact
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sys module try statement with multi
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float( ) built-in function 2nd floa
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eturn values standard type 2nd vari
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grouping 2nd groups( ) method GTK+
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installing Python instance attribut
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through files iterators about any n
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list( ) built-in function 2nd list(
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for re module group(s) invoking 2nd
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modulus operator MRO [See method re
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and OOP classic classes vs. descrip
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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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