Py Closures — Free Python Tutorial
Learn Py Closures in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Py Closures in Python with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Py Closures in Python
A closure is a function that captures variables from its enclosing scope. The inner function "remembers" those variables even after the outer function has returned.
Three conditions: nested function, inner function uses outer variable, outer function returns inner function. Closures are the mechanism behind decorators, factory functions, and callbacks.
Use nonlocal keyword to reassign (not just mutate) a variable from the enclosing scope inside a closure.
Py Closures — Syntax
def outer(x): # x is captured
def inner(y): # inner is the closure
return x + y # x from outer scope
return inner
add5 = outer(5)
print(add5(3)) # → 8
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