Home Backend Development Python Tutorial Python过滤函数filter()使用自定义函数过滤序列实例

Python过滤函数filter()使用自定义函数过滤序列实例

Jun 06, 2016 am 11:32 AM
filter() python filter function

filter函数:

filter()函数可以对序列做过滤处理,就是说可以使用一个自定的函数过滤一个序列,把序列的每一项传到自定义的过滤函数里处理,并返回结果做过滤。最终一次性返回过滤后的结果。

filter()函数有两个参数:

第一个,自定函数名,必须的
第二个,需要过滤的列,也是必须的

DEMO

需求,过滤大于5小于10的数:

代码如下:


# coding=utf8
# 定义大于5小于10的函数
def guolvhanshu(num):
    if num>5 and num         return num
 
# 定义一个序列
seq=(12,50,8,17,65,14,9,6,14,5)
 
# 使用filter函数
result=filter(guolvhanshu,seq)
 
# (8,9,6)
print result


执行结果:

代码如下:


(8, 9, 6)


因为8,9,6大于5,小于10所以被过滤下来了。
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