#40 Python Tutorial for Beginners | Recursion

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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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