How to use the pyqpanda.Algorithm.fragments.parity_check_circuit function in pyqpanda

`QPanda Algorithm API`\n
    Simulating z-only term like H=coef * (Z0..Zn-1)\n
    U=exp(-iHt)\n
    \n
    list, float, float -> QCircuit

    Note: Z-Hamiltonian spreads over the qubit_list
    '''
    prog=QCircuit()

    # parity-check
    # RZ(theta)
    # parity-check

    if len(qubit_list) > 1:
        prog.insert(parity_check_circuit(qubit_list))\
            .insert(RZ(qubit_list[-1],coef*t))\
            .insert(parity_check_circuit(qubit_list))
    else:
        if len(qubit_list)!=0:
            prog.insert(RZ(qubit_list[0],coef*t))

    return prog

U=exp(-iHt)\n
    \n
    list, float, float -> QCircuit

    Note: Z-Hamiltonian spreads over the qubit_list
    '''
    prog=QCircuit()

    # parity-check
    # RZ(theta)
    # parity-check

    if len(qubit_list) > 1:
        prog.insert(parity_check_circuit(qubit_list))\
            .insert(RZ(qubit_list[-1],coef*t))\
            .insert(parity_check_circuit(qubit_list))
    else:
        if len(qubit_list)!=0:
            prog.insert(RZ(qubit_list[0],coef*t))

    return prog