https://github.com/TheAlgorithms/Python/blob/7b267e5e4f8ccb72dd58fcf0057642fd62a36bdf/conversions/decimal_to_binary.py#L4 Please change __decimal_to_binary()__ to return identical values as the Python builtin [__bin()__](https://docs.python.org/3/library/functions.html#bin). With doctests to prove it please. @PatOnTheBack @Corruption13