Read setup.py to string
        :return:

def read_setup_py_source(self):  # type: () -> None
        """
        Read setup.py to string
        :return:
        """
        if not self.setup_file_name:
            self.setup_source = ""
        if not self.setup_source:
            self.setup_source = self._read_file(self.setup_file_name)