TypeError: coercing to Unicode: need string or buffer, NoneType found in Python

Dung Do Tien Sep 17 2021 762

Currently I write a function for a program and one component is to find out if separate variables are used in the python file. Like this:

def SINGLE_CHAR_VAR(python_filename):
    file = open(python_filename)
    lines = [0]
    for line in file:
        stripped = line.strip('\n\r')

    from utils import vars_indents
    variable_list = (vars_indents(python_filename))[0]
    for i in range(1, len(variable_list)):
        if len(variable_list[i][0][0]) == 1:
            SINGLE_CHAR_VAR.append(['SINGLE_CHAR_VAR', i, variable_list[i][0][1], variable_list[i][0][0], lines[i]])      
    return SINGLE_CHAR_VAR

When I used the function on its own - the function works correctly. However, when I call the program as a whole - I get the following error message TypeError: coercing to Unicode: need string or buffer, NoneType found:

Traceback (most recent call last):
  File "<web session>", line 1, in <module>
  File "lint_2.py", line 141, in lint
    sorted_error_list = sorted_list(list_of_file_errors)
  File "lint_2.py", line 84, in sorted_list
    error_list = total_error_list(python_filename)
  File "lint_2.py", line 65, in total_error_list
    single_char_var_list = SINGLE_CHAR_VAR(python_filename)
  File "lint_2.py", line 33, in SINGLE_CHAR_VAR
    file = open(python_filename)
TypeError: coercing to Unicode: need string or buffer, NoneType found

I have absolutely no idea where I am wrong - any help would be very, very, very welcome !!!

Thanks for any suggestions.

Have 2 answer(s) found.
  • p

    pablo C Sep 17 2021

    Try to write it like this:


    It should work.

  • D

    Dhiraj Goplani Sep 17 2021

    Why python_filename is this None, you cannot tell from the code you posted. The feedback you provided assumes the value comes from a function sorted_list(), I suggest you start looking for clues there:

    File "lint_2.py", line 84, in sorted_list
       error_list = total_error_list(python_filename)

    However, this is just speculation; you will have to trace through all the code in this trace to see exactly where it is being None installed the first time.

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