Python中有关filter的用法详解

1 class filter(object)

2  |  filter(function or None, iterable) --> filter object

3  | 

4  |  Return an iterator yielding those items of iterable for which function(item)

5  |  is true. If function is None, return the items that are true.

1 In [2]: import re

2 In [3]: i = re.split(',',"123,,123213,,,123213,")

3 In [4]: i4 Out[4]: ['123', '', '123213', '', '', '123213', '']

1 In [7]: print(*filter(None, i))

2 123 123213 123213

In [9]: print(list(filter(lambda x:x=='', i)))

['', '', '', '']