def __read_source_file(self):
with open(self._source_filename, '<STR_LIT:r>', encoding=self._routine_file_encoding) as file:<EOL><INDENT>self._routine_source_code = file.read()<EOL><DEDENT>self._routine_source_code_lines = self._routine_source_code.split("<STR_LIT:\n>")<EOL>
Reads the file with the source of the stored routine.