Python · Functions

map() / filter()

Applies or filters lazily. Comprehensions are usually more readable in Python.

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Syntax

map(fn, iterable)

Example

Open in the lab

print(list(map(str.upper, ["a", "b"])))
print(list(filter(None, [0, 1, "", "x"])))

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.