I think you mean to use map
instead of filter
:
>>> from string import upper >>> mylis=['this is test', 'another test'] >>> map(upper, mylis) ['THIS IS TEST', 'ANOTHER TEST']
Even simpler, you could use str.upper
instead of importing from string
(thanks to @alecxe):
>>> map(str.upper, mylis) ['THIS IS TEST', 'ANOTHER TEST']
In Python 2.x, map
constructs a new list by applying a given function to every element in a list. filter
constructs a new list by restricting to elements that evaluate to True
with a given function.
In Python 3.x, map
and filter
construct iterators instead of lists, so if you are using Python 3.x and require a list the list comprehension approach would be better suited.
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