if len(x) > 0:
        print x

None没有strip属性，为嘛换个位置就报错

>>> print filter(lambda x: x and x.strip(),['test', None, '', 'st r', '  ', 'END'])

['test', 'st r', 'END']

>>> print filter(lambda x: x.strip() and x,['test', None, '', 'st r', '  ', 'END'])

Traceback (most recent call last):

  File "<pyshell#58>", line 1, in <module>

    print filter(lambda x: x.strip() and x,['test', None, '', 'st r', '  ', 'END'])

  File "<pyshell#58>", line 1, in <lambda>

    print filter(lambda x: x.strip() and x,['test', None, '', 'st r', '  ', 'END'])

AttributeError: 'NoneType' object has no attribute 'strip'

>>> print filter(lambda x: len(x.strip()) > 0 and x,['test',None, '', 'st r', '  ', 'END'])

Traceback (most recent call last):

  File "<pyshell#70>", line 1, in <module>

    print filter(lambda x: len(x.strip()) > 0 and x,['test',None, '', 'st r', '  ', 'END'])

  File "<pyshell#70>", line 1, in <lambda>

    print filter(lambda x: len(x.strip()) > 0 and x,['test',None, '', 'st r', '  ', 'END'])

AttributeError: 'NoneType' object has no attribute 'strip'