#40 Python Tutorial for Beginners | Recursion

Pubblicato il: 03 agosto 2018
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In this lecture we will learn:
Recursion in Python
How to call a function inside the same function?
How to set the limit for recursion in Python?
Use of sys library functions
Why recursion is useful?


#1
Recursion means calling a function from itself.
To print a statement of a function multiple times, we can call a function inside the same function.
By default, a function inside a function will execute infinite times.
Maximum limit for recursion is 1000 in python, so it will give an error after exceeding its limit.
Limit can also be changed by doing some customization.
If a code goes into recursion without a condition and it goes to infinite times, then it may hang the system and that limit is set in python.
We can also print the limit of recursion by using the function getrecursionlimit() available in the sys library.
We can change the limit for a recursion by using the setrecursionlimit() function.
We can set the limit to any number by providing it in the setrecursionlimit() method.
We have to make the variable global to access it if it is defined outside the scope.
Recursion is used to perform several tasks in many projects.

#2
A complicated function can be split down into smaller sub-problems by using the recursion.
Recursive functions make the code look simple and effective.


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