python几个内置函数
[*]filter
故名思意，是过滤的意思
>>> l
>>> def f(x):
if x%2 == 0:
return True
>>> f(4)
True
>>> filter(f,l)
2. zip
>>> name=['xiaoming','xiaoli','xiaolan']
>>> age=
>>> tel=['133','134','156']
>>> zip(name,age,tel)
[('xiaoming', 12, '133'), ('xiaoli', 23, '134'), ('xiaolan', 34, '156')]>>> test=
>>> zip(name,age,tel,test)
[('xiaoming', 12, '133', 1), ('xiaoli', 23, '134', 2)]
3.map
>>> map(None,name,age,tel)
[('xiaoming', 12, '133'), ('xiaoli', 23, '134'), ('xiaolan', 34, '156')]
>>> map(None,name,age,tel,test)
[('xiaoming', 12, '133', 1), ('xiaoli', 23, '134', 2), ('xiaolan', 34, '156', None)]
>>> a=
>>> b=
>>> def f(x,y):
return x*y
>>> map(f,a,b)
>>> map(None,a,b)
[(1, 5), (3, 6), (4, 7)]
>>> map(f,a,b)
4.reduce
l=range(1,101)
>>> def f(x,y):
return x+y
>>> reduce(f,l)
5050
>>> reduce(lambda x,y:x+y,l)
5050
>>>
通过实例可以看出这几个函数还是很有用处的。
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