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CS 931: Dictionaries

CS 931: Dictionaries. Dictionaries. >>> inventory = {} # an empty dictionary >>> inventory['apple'] = 6 >>> inventory['orange'] = 12 >>> inventory['banana'] = 4 >>> inventory['orange'] 4 >>> inventory['coconut'] Traceback (most recent call last):

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CS 931: Dictionaries

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  1. CS 931: Dictionaries

  2. Dictionaries >>> inventory = {} # an empty dictionary >>> inventory['apple'] = 6 >>> inventory['orange'] = 12 >>> inventory['banana'] = 4 >>> inventory['orange'] 4 >>> inventory['coconut'] Traceback (most recent call last): File "<pyshell#49>", line 1, in <module> inventory['coconuts'] KeyError: 'coconuts' >>>

  3. Dictionaries >>> def addfruit(fruit, quant, inv): if fruit in inv: inv [fruit] += quant else: inv [fruit] = quant >>> addfruit('orange', 6) >>> addfruit('guava', 3) >>> inventory['orange'] 18 >>> inventory['guava'] 3

  4. Dictionaries iterates over inventory’s keys >>> def printinventory(): for f in inventory.iterkeys(): print f, inventory[f] >>> printinventory() orange 18 guava 3 apple 6 banana 4

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