Python Closures Explained | What are Closures in Python | Python Closures

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Closures in Python

Agenda
03 Example
01 Prerequisite
04 Use case
02 Definition

Prerequisite

Prerequisite
First class function
First class functions allows us to treat functions as any other objects, so that we can use them to:
 pass as an argument to another function
 return the function from another function
 assign the function to another variable
Nested function
Python supports the concept of a "nested function" or "inner function", which is simply a function
defined inside another function.
Note: Not to be confused with recursive functions

Definition

Definition
Closure is an inner function that remembers and has access to the variables in the local scope in which
it was created even after the outer function has finished executing.
A closure closes over their free variable from their environment

Example

Use case

Use case
 To replace the unnecessary use of class: Suppose you have a class that contains just one method
besides the __init__ method. In such cases, it is better to use a closure instead of a class.
 To avoid the use of the global scope: If you have global variables which only one function in your
program will use, think closure. Define the variables in the outer function and use them in the inner
function.
 To implement data hiding: The only way to access the enclosed function is by calling the enclosing
function. There is no way to access the inner function directly.
 To remember a function environment even after it completes its execution: You can then access the
variables of this environment later in your program.

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Python Closures Explained | What are Closures in Python | Python Closures

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