def get_program(self, program_id: str) -> abstract_program.AbstractProgram:
        """Returns an existing AbstractProgram given an identifier.

        Args:
            program_id: Unique ID of the program.

        Returns:
            An AbstractProgram object for the program.
        """
Returns an existing AbstractProgram given an identifier.

        Args:
            program_id: Unique ID of the program.

        Returns:
            An AbstractProgram object for the program.
        
cirq-google/cirq_google/engine/abstract_engine.py