CODEWITHSUNDEEP
python
John
John

Reputation: 13705

'NoneType' object has no attribute 'append' in python

I have the following function in python:

def find_str(s, m):
    starting_points = find_starting_points(s,m)
    solution = []
    for i in range(0, len(starting_points)):
        position = starting_points[i]
        solution.append([position])
        solution = build_solution(position, s, m, solution)
    return solution
    pass

When I run the file in ipython, I get the following error:

     55     for i in range(0, len(starting_points)):
     56         position = starting_points[i]
---> 57         solution.append([position])
     58         solution = build_solution(position, s, m, solution)
     59     return solution

AttributeError: 'NoneType' object has no attribute 'append'

Why am I getting that error?

Upvotes: 0

Views: 1041

Answers (1)

BrenBarn
BrenBarn

Reputation: 251383

Your build_solution function is, at some point, returning None. Since you set solution to the return of this function, you are setting it to None.

I can't be more specific unless you show the code for build_solution.

Upvotes: 8

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