old_contents: # -*- coding: utf-8 -*-
  
  # Copyright 2017, IBM.
  #
  # This source code is licensed under the Apache License, Version 2.0 found in
  # the LICENSE.txt file in the root directory of this source tree.
  
  """
  Unitary gate.
  """
  from ._instruction import Instruction
  from ._quantumregister import QuantumRegister
  from ._qiskiterror import QISKitError
  
  
  class Gate(Instruction):
      """Unitary gate."""
  
      def __init__(self, name, param, args, circuit=None):
          """Create a new composite gate.
  
          name = instruction name string
          param = list of real parameters (will be converted to symbolic)
          args = list of pairs (Register, index)
          circuit = QuantumCircuit or CompositeGate containing this gate
          """
          self._is_multi_qubit = False
          self._qubit_coupling = [arg[1] for arg in args]
          self._is_multi_qubit = (len(args) > 1)
          for argument in args:
              if not isinstance(argument[0], QuantumRegister):
                  raise QISKitError("argument not (QuantumRegister, int) "
                                    + "tuple")
  
          super().__init__(name, param, args, circuit)
  
      def inverse(self):
          """Invert this gate."""
          raise QISKitError("inverse not implemented")
  
      def q_if(self, *qregs):
          """Add controls to this gate."""
          # pylint: disable=unused-argument
          raise QISKitError("control not implemented")
  
      def is_multi_qubit(self):
          """Returns True if this Gate uses multiple qubits as arguments"""
          return self._is_multi_qubit
  
      def get_qubit_coupling(self):
          """Gets the coupling graph of the qubits in case this is a multi-qubit gate"""
          if not self.is_multi_qubit():
              raise QISKitError("Can't get the qubit coupling of non multi-qubit gates!")
          return self._qubit_coupling
  
new_contents: # -*- coding: utf-8 -*-
  
  # Copyright 2017, IBM.
  #
  # This source code is licensed under the Apache License, Version 2.0 found in
  # the LICENSE.txt file in the root directory of this source tree.
  
  """
  Unitary gate.
  """
  from ._instruction import Instruction
  from ._quantumregister import QuantumRegister
  from ._qiskiterror import QISKitError
  
  
  class Gate(Instruction):
      """Unitary gate."""
  
      def __init__(self, name, param, args, circuit=None):
          """Create a new composite gate.
  
          name = instruction name string
          param = list of real parameters (will be converted to symbolic)
          args = list of pairs (Register, index)
          circuit = QuantumCircuit or CompositeGate containing this gate
          """
          self._is_multi_qubit = False
          self._qubit_coupling = [arg[1] for arg in args]
          self._is_multi_qubit = (len(args) > 1)
          for argument in args:
              if not isinstance(argument[0], QuantumRegister):
                  raise QISKitError("argument not (QuantumRegister, int) "
                                    + "tuple")
  
          super().__init__(name, param, args, circuit)
  
      def inverse(self):
          """Invert this gate."""
          raise QISKitError("inverse not implemented")
  
      def q_if(self, *qregs):
          """Add controls to this gate."""
          # pylint: disable=unused-argument
          raise QISKitError("control not implemented")
  
subject: remove unused methods from Gate