#过滤器
#通过 过滤器 可以保留自己需要资源

value=http://www.mamicode.com/filter(None,[1,-1,0,True,False,[1,0,True,False],[]])>

============= RESTART: C:/Users/Administrator/Desktop/mytest7.py =============
[1, -1, True, [1, 0, True, False]]
>>> 

>>> help(filter)
Help on class filter in module builtins:

class filter(object)
 |  filter(function or None, iterable) --> filter object
 |  
 |  Return an iterator yielding those items of iterable for which function(item)
 |  is true. If function is None, return the items that are true.
 |  
 |  Methods defined here:
 |  
 |  __getattribute__(self, name, /)
 |      Return getattr(self, name).
 |  
 |  __iter__(self, /)
 |      Implement iter(self).
 |  
 |  __new__(*args, **kwargs) from builtins.type
 |      Create and return a new object.  See help(type) for accurate signature.
 |  
 |  __next__(self, /)
 |      Implement next(self).
 |  
 |  __reduce__(...)
 |      Return state information for pickling.

>>>