code: def import_operator(
      qubit_observable, format="openfermion", wires=None, tol=1e010
  ):
      r"""Convert an external operator to a PennyLane operator.
  
      We currently support `OpenFermion <https://quantumai.google/openfermion>`__ operators: the function accepts most types of
      OpenFermion qubit operators, such as those corresponding to Pauli words and sums of Pauli words.
  
      Args:
          qubit_observable: external qubit operator that will be converted
          format (str): the format of the operator object to convert from
          wires (.Wires, list, tuple, dict): Custom wire mapping used to convert the external qubit
              operator to a PennyLane operator.
              For types ``Wires``/list/tuple, each item in the iterable represents a wire label
              for the corresponding qubit index.
              For type dict, only int-keyed dictionaries (for qubit-to-wire conversion) are accepted.
              If ``None``, the identity map (e.g., ``0->0, 1->1, ...``) will be used.
          tol (float): Tolerance in `machine epsilon <https://numpy.org/doc/stable/reference/generated/numpy.real_if_close.html>`_
              for the imaginary part of the coefficients in ``qubit_observable``.
              Coefficients with imaginary part less than :math:`(2.22 \cdot 10^{-16}) \cdot \text{tol}` are considered to be real.
  
      Returns:
          (.Operator): PennyLane operator representing any operator expressed as linear combinations of
          Pauli words, e.g.,
          :math:`\sum_{k=0}^{N-1} c_k O_k`
  
      **Example**
  
      >>> from openfermion import QubitOperator
      >>> h_of = QubitOperator('X0 X1 Y2 Y3', -0.0548) + QubitOperator('Z0 Z1', 0.14297)
      >>> h_pl = import_operator(h_of, format='openfermion')
      >>> print(h_pl)
      (0.14297) [Z0 Z1]
      + (-0.0548) [X0 X1 Y2 Y3]
  
      If the new op-math is active, an arithmetic operator is returned instead.
  
      >>> qml.operation.enable_new_opmath()
      >>> h_pl = import_operator(h_of, format='openfermion')
      >>> print(h_pl)
      (-0.0548*(PauliX(wires=[0]) @ PauliX(wires=[1]) @ PauliY(wires=[2]) @ PauliY(wires=[3]))) + (0.14297*(PauliZ(wires=[0]) @ PauliZ(wires=[1])))
      """
      if format not in ["openfermion"]:
          raise TypeError(
              f"Converter does not exist for {format} format."
          )
  
      coeffs = np.array(
          [
              np.real_if_close(coef, tol=tol)
              for coef in qubit_observable.terms.values()
          ]
      )
  
      if any(np.iscomplex(coeffs)):
          warnings.warn(
              f"The coefficients entering the QubitOperator must be real;"
              f" got complex coefficients in the operator"
              f" {list(coeffs[np.iscomplex(coeffs)])}"
          )
  
      if active_new_opmath():
          return qml.dot(
              *_openfermion_to_pennylane(qubit_observable, wires=wires)
          )
  
      return qml.Hamiltonian(
          *_openfermion_to_pennylane(qubit_observable, wires=wires)
      )
  
imports: import warnings
  from itertools import product
  import numpy
  import pennylane
  from pennylane.operation import Tensor, active_new_opmath
  from pennylane.pauli import pauli_sentence
  from pennylane.wires import Wires
label_desc: Use image node_id 6 for calling a global function with example usage: import_operator(qubit_observable, format, wires, tol) and returns: qml, qml