Zelle - Chapter 11.pdf - CTools

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counts = dict() print "Enter a line of text:" line = raw_input("") words = line.split() print "Words:", words print "Counting..." for word in words: counts[word] = counts.get(word,0) + 1 print "Counts", counts python wordcount.py Enter a line of text: the clown ran after the car and the car ran into the tent and the tent fell down on the clown and the car Words: ['the', 'clown', 'ran', 'after', 'the', 'car', 'and', 'the', 'car', 'ran', 'into', 'the', 'tent', 'and', 'the', 'tent', 'fell', 'down', 'on', 'the', 'clown', 'and', 'the', 'car'] Counting... Counts {'and': 3, 'on': 1, 'ran': 2, 'car': 3, 'into': 1, 'after': 1, 'clown': 2, 'down': 1, 'fell': 1, 'the': 7, 'tent': 2}
Summary: Two Collections • List • A linear collection of values that stay in order • Dictionary • A “bag” of values, each with its own label / tag
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 and 8: The Python List Object
Page 9 and 10: print grades [100, 97, 100] >>> new
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: Counting Words python wordcount.py

Zelle - Chapter 11.pdf - CTools

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