Zelle - Chapter 11.pdf - CTools

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grades = list() >>> grades.append(100) >>> grades.append(97) >>> grades.append(100) >>> print sum(grades) 297 >>> print grades [100, 97, 100] >>> print sum(grades)/3.0 99.0 >>> The grades variable will have a list of values. Append some values to the list. Add up the values in the list using the sum () function. What is in the list? Figure the average...
print grades [100, 97, 100] >>> newgr = list(grades) >>> print newgr [100, 97, 100] >>> newgr[1] = 85 >>> print newgr [100, 85, 100] >>> print grades [100, 97, 100] What is in grades? Make a copy of the entire grades list. Change the second new grade (starts at [0]) The original grades are unchanged.
Page 1 and 2: Data Collections Zelle - Chapter 11
Page 3 and 4: What is a Collection? • A collect
Page 5 and 6: Terminology: Object • An Object i
Page 7: The Python List Object
Page 11 and 12: Why lists start at zero? • Initia
Page 13 and 14: lst = [ 21, 14, 4, 3, 12, 18] >>> p
Page 15 and 16: Quick Peek: Object Oriented
Page 17 and 18: One way to find out Capabilities Bu
Page 19 and 20: Try dir() with a String >>> y = “
Page 21 and 22: Object Oriented Summary • Variabl
Page 23 and 24: Dictionaries • Dictionaries are P
Page 25 and 26: purse = dict() >>> purse['money'] =
Page 27 and 28: lst = list() >>> lst.append(21) >>>
Page 29 and 30: Dictionary Literals (Constants) •
Page 31 and 32: Dictionary Patterns • It is an er
Page 33 and 34: Dictionary Counting • Since it is
Page 35 and 36: Retrieving lists of Keys and Values
Page 37 and 38: Dictionary Maximum Loop $ cat dictm
Page 39 and 40: Dictionaries are not Ordered >>> dc
Page 41 and 42: Counting Words python wordcount.py
Page 43 and 44: Summary: Two Collections • List

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