code: def meanfield(
      symbols,
      coordinates,
      name="molecule",
      charge=0,
      mult=1,
      basis="sto-3g",
      package="pyscf",
      outpath=".",
  ):  # pylint: disable=too-many-arguments
      r"""Generates a file from which the mean field electronic structure
      of the molecule can be retrieved.
  
      This function uses OpenFermion-PySCF plugins to
      perform the Hartree-Fock (HF) calculation for the polyatomic system using the quantum
      chemistry packages ``PySCF``. The mean field electronic
      structure is saved in an hdf5-formatted file.
  
      The charge of the molecule can be given to simulate cationic/anionic systems.
      Also, the spin multiplicity can be input to determine the number of unpaired electrons
      occupying the HF orbitals as illustrated in the figure below.
  
      |
  
      .. figure:: ../../_static/qchem/hf_references.png
          :align: center
          :width: 50%
  
      |
  
      Args:
          symbols (list[str]): symbols of the atomic species in the molecule
          coordinates (array[float]): 1D array with the atomic positions in Cartesian
              coordinates. The coordinates must be given in atomic units and the size of the array
              should be ``3*N`` where ``N`` is the number of atoms.
          name (str): molecule label
          charge (int): net charge of the system
          mult (int): Spin multiplicity :math:`\mathrm{mult}=N_\mathrm{unpaired} + 1` for
              :math:`N_\mathrm{unpaired}` unpaired electrons occupying the HF orbitals.
              Possible values for ``mult`` are :math:`1, 2, 3, \ldots`. If not specified,
              a closed-shell HF state is assumed.
          basis (str): Atomic basis set used to represent the HF orbitals. Basis set
              availability per element can be found
              `here <www.psicode.org/psi4manual/master/basissets_byelement.html#apdx-basiselement>`_
          package (str): Quantum chemistry package used to solve the Hartree-Fock equations.
          outpath (str): path to output directory
  
      Returns:
          str: absolute path to the file containing the mean field electronic structure
  
      **Example**
  
      >>> symbols, coordinates = (['H', 'H'], np.array([0., 0., -0.66140414, 0., 0., 0.66140414]))
      >>> meanfield(symbols, coordinates, name="h2")
      ./h2_pyscf_sto-3g
      """
      openfermion, openfermionpyscf = _import_of()
  
      if coordinates.size != 3 * len(symbols):
          raise ValueError(
              f"The size of the array 'coordinates' has to be 3*len(symbols) = {3 * len(symbols)};"
              f" got 'coordinates.size' = {coordinates.size}"
          )
  
      package = package.strip().lower()
  
      if package not in "pyscf":
          error_message = (
              f"Integration with quantum chemistry package '{package}' is not available. \n Please set"
              f" 'package' to 'pyscf'."
          )
          raise TypeError(error_message)
  
      filename = name + "_" + package.lower() + "_" + basis.strip()
      path_to_file = os.path.join(outpath.strip(), filename)
  
      geometry = [
          [
              symbol,
              tuple(
                  np.array(coordinates)[3 * i : 3 * i + 3] * bohr_angs
              ),
          ]
          for i, symbol in enumerate(symbols)
      ]
  
      molecule = openfermion.MolecularData(
          geometry, basis, mult, charge, filename=path_to_file
      )
  
      if package == "pyscf":
          # pylint: disable=import-outside-toplevel
          from openfermionpyscf import run_pyscf
  
          run_pyscf(molecule, run_scf=1, verbose=0)
  
      return path_to_file
  
file_path: pennylane/pennylane/qchem/openfermion_obs.py
imports: import os
  import numpy
  import pennylane
  from pennylane.operation import active_new_opmath
label_desc: Use image node_id 6 for calling a global function with example usage: meanfield(symbols, coordinates, name, charge, mult, basis, package, outpath) and returns: path_to_file