Python 201 - Interactively Learn Advanced Concepts in Python 3/

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Functions of filter and map

Functions of filter and map

Let's talk about filter and map functions in Python.

We'll cover the following...

filter

The filter built-in function will take a function and an iterable and return an iterator for those elements within the iterable for which the passed in function returns True. That statement sounds a bit confusing to read.

Example of filter()

Let’s look at an example:

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def less_than_ten(x):
    return x < 10
my_list = [1, 2, 3, 10, 11, 12]
for item in filter(less_than_ten, my_list):
    print(item)

Here we create a simple function that tests if the integer we pass ...