# -*- coding: utf-8 -*-
#python 27
#xiaodeng
#Python之filter筛选数据工具
#http://python.jobbole.com/82597/ #1)filter语法格式:
'''
filter(...)
filter(function or None, sequence) -> list, tuple, or string
'''
function:函数名
sequence:序列 #filter, 过滤
print list(filter((lambda x:x>0),range(-5,5)))#[1, 2, 3, 4] #等价于:
#2)案例
k=range(-5,5)
def func(x):
if x>0:
return x result=filter(func,k)
print result,type(result)#[1, 2, 3, 4] <type 'list'>