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#1
November 21st, 2003, 12:47 PM
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using iterator on a dictionary
how do you iteratre through a dictionaries keys? i see that a dictionary has iterkeys() that returns an iterator over the ekys, but i have no idea how to use the iterator object and documentation on the web stinks
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#2
November 21st, 2003, 03:48 PM
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There are actually a few ways you can iterate over a dictionary, so you dont have to use an iterator anyway.. but heres a few working examples anyway!
Code:
dictionary = {'1': 'one', '2': 'two', '3': 'there'}
for key in dictionary.iterkeys():
print key, dictionary[key]
Code:
dictionary = {'1': 'one', '2': 'two', '3': 'there'}
for key in dictionary.keys():
print key, dictionary[key]
Code:
dictionary = {'1': 'one', '2': 'two', '3': 'there'}
for key, value in dictionary.items():
print key, value
Mark.
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#3
November 21st, 2003, 04:17 PM
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Here's another...
In python 2.2,2.3 you can iterate directly over dictionaries because they contain an iterator object. The dictionary iterator will return the next key in the un-ordered list of keys. So you can do this Code:
a = {"tom":2.3,"****":21.1,"harry":1.1}
for key in a:
print key, a[key]
where in calls the next method of the iterator. I just noticed you can't use *Richard* in an example!
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#4
November 21st, 2003, 04:23 PM
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There's also the dict.items(), which returns a tuple containing the key and the value.
Code:
>>> for (key, item) in {1:2,2:3,3:4}.items():
... print key, item
...
1 2
2 3
3 4
>>>
I know you asked for the keys, but it's useful sometimes to get the item straight-away.
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