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

  • 2020-04-02 14:00:16
  • OfStack

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


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
# use filter function
# (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.

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