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Learn Functional Programming in Python

Filter

Explore the filter function to selectively remove elements from iterables by applying a testing function. Learn how to use filter with lambda expressions and built-in functions to efficiently process data, returning an iterator with only items that meet specified criteria.

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Filtering iterables

The filter function can be used to remove items from an iterable based on a testing function. It returns an iterator to access the result. Here is an example:

Python 3.8
a = [3, 2, 1, 6, 7, 0] 
f = filter(lambda x: x > 2, a) 
print(list(f))
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