The Python filter of filters a sequence instance using a custom function

The filter function:

The filter() function filters a sequence, meaning that you can use a custom function to filter a sequence, pass each item of the sequence to a custom filter, and return the result to filter. The filtered result is returned once.

The filter() function takes two arguments:

The first one, the name of the custom function, is required
Second, columns that need to be filtered are also required

The DEMO

Demand, filter the number greater than 5 and less than 10:

# coding=utf8

#  Definition is greater than the 5 Less than 10 The function of 

def guolvhanshu(num):

    if num>5 and num<10:

        return num

 

#  Define a sequence 

seq=(12,50,8,17,65,14,9,6,14,5)

 

#  use filter function 

result=filter(guolvhanshu,seq)

 

# (8,9,6)

print result

Execution results:

(8, 9, 6)

Because 8,9,6 is greater than 5 and less than 10 so it's filtered out.