[Solved] Function is returning NoneType in Python instead of integer [closed]

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To elaborate on comments from Nin17 and molbdnilo:

Your function function(n) is supposed to return an integer value.
Like you did in if branch with return(n**2), do return in the else branch:

def function(n):
    if n % 4 == 1:
      return n**2
    else:      
      return function(n + 1)  # inlined the increased n and do return

I would recommend to give the function a meaningful name.

A function like yours that calls itself is a recursive function. One of it’s key-mechanisms is that it returns a value.

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solved Function is returning NoneType in Python instead of integer [closed]