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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _read_python_source(self, filename):
 """ Do our best to decode a Python source file correctly. """

        try:
            f = open(filename, "rb")
        except IOError as err:
            self.log_error("Can't open %s: %s", filename, err)
            return None, None
        try:
            encoding = tokenize.detect_encoding(f.readline)[0]
        finally:
            f.close()
        with _open_with_encoding(filename, "r", encoding=encoding) as f:
            return _from_system_newlines(f.read()), encoding