Web Reference: Nov 8, 2025 · Functional programming in Python is supported by three powerful built-in functions — map (), reduce (), and filter (). These functions enable efficient data transformation and processing by applying operations to entire iterables (like lists or tuples) without using explicit loops. The map(), filter() and reduce() functions bring a bit of functional programming to Python. All three of these are convenience functions that can be replaced with List Comprehensionsor loops, but provide a more elegant and short-hand approach to some problems. Before continuing, we'll go over a few things you should be familiar with before reading ... Essentially, these three functions allow you to apply a function across a number of iterables, in one fell swoop. map and filter come built-in with Python (in the __builtins__ module) and require no importing. reduce, however, needs to be imported as it resides in the functools module.
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