Python Program to Flatten a Nested List using Recursion

Today we are going to share a Python Program to Flatten a Nested List using Recursion. If you are a python beginner and want to start learning the python programming, then keep your close attention in this tutorial as I am going to share a Python Program to Flatten a Nested List using Recursion.

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Python Program to Flatten a Nested List using Recursion code

Copy the below python program and execute it with the help of python compiler.

def flatten(S):

if S == []:

return S

if isinstance(S[0], list):

return flatten(S[0]) + flatten(S[1:])

return S[:1] + flatten(S[1:])

s=[[1,2],[3,4]]

print("Flattened list is: ",flatten(s))

Output:

Flattened list is: [1, 2, 3, 4]

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Python Program to Flatten a Nested List using Recursion