Answer by CopyPasteIt for Python int to binary string?

Here is a (debugged) program that uses divmod to construct a binary list:

Program

while True:    indecimal_str = input('Enter positive(decimal) integer: ')    if indecimal_str == '':        raise SystemExit    indecimal_save = int(indecimal_str)    if indecimal_save < 1:        print('Rejecting input, try again')        print()        continue    indecimal = int(indecimal_str)    exbin = []    print(indecimal, '<->', exbin)    while True:        if indecimal == 0:            print('Conversion:', indecimal_save, '=', "".join(exbin))            print()            break        indecimal, r = divmod(indecimal, 2)        if r == 0:            exbin.insert(0, '0')        else:            exbin.insert(0, '1')        print(indecimal, '<->', exbin)

Output

Enter positive(decimal) integer: 88 <-> []4 <-> ['0']2 <-> ['0', '0']1 <-> ['0', '0', '0']0 <-> ['1', '0', '0', '0']Conversion: 8 = 1000Enter positive(decimal) integer: 6363 <-> []31 <-> ['1']15 <-> ['1', '1']7 <-> ['1', '1', '1']3 <-> ['1', '1', '1', '1']1 <-> ['1', '1', '1', '1', '1']0 <-> ['1', '1', '1', '1', '1', '1']Conversion: 63 = 111111Enter positive(decimal) integer: 409409 <-> []204 <-> ['1']102 <-> ['0', '1']51 <-> ['0', '0', '1']25 <-> ['1', '0', '0', '1']12 <-> ['1', '1', '0', '0', '1']6 <-> ['0', '1', '1', '0', '0', '1']3 <-> ['0', '0', '1', '1', '0', '0', '1']1 <-> ['1', '0', '0', '1', '1', '0', '0', '1']0 <-> ['1', '1', '0', '0', '1', '1', '0', '0', '1']Conversion: 409 = 110011001