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This is a little code for making a list that can have only items from a list of types

Python, 5 lines
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def homogeneous(mylist, *types):
    '''
    >>> homogeneous([ 12, 3, 4, 4.33, 3.14, 'ola', 'string', [], None, [1, 3, 3], {}], int, type(None)) => [12, 3, 4, None]
    '''
    return [item for item in mylist if type(item) in types]      

1 comment

Kent Johnson 12 years, 7 months ago  # | flag

isinstance() can take a tuple of types so your recipe is almost the same as

[ item for item in mylist if isinstance(item, types) ]

The only difference is that isinstance() allows sub-types.

Created by marlonamor on Tue, 14 Apr 2009 (MIT)
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