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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_molecule(cls, mol, theory, charge=None, spin_multiplicity=None, basis_set="6-31g", basis_set_option="cartesian", title=None, operation="optimize", theory_directives=None, alternate_directives=None):
 """ Very flexible arguments to support many types of potential setups. Users should use more friendly static methods unless they need the flexibility. Args: mol: Input molecule charge: Charge of the molecule. If None, charge on molecule is used. Defaults to None. This allows the input file to be set a charge independently from the molecule itself. spin_multiplicity: Spin multiplicity of molecule. Defaults to None, which means that the spin multiplicity is set to 1 if the molecule has no unpaired electrons and to 2 if there are unpaired electrons. basis_set: The basis set to be used as string or a dict. E.g., {"C": "6-311++G**", "H": "6-31++G**"} or "6-31G". If string, same basis set is used for all elements. basis_set_option: cartesian (default) | spherical, title: Title for the task. Defaults to None, which means a title based on the theory and operation of the task is autogenerated. theory: The theory used for the task. Defaults to "dft". operation: The operation for the task. Defaults to "optimize". theory_directives: A dict of theory directives. For example, if you are running dft calculations, you may specify the exchange correlation functional using {"xc": "b3lyp"}. alternate_directives: A dict of alternate directives. For example, to perform cosmo calculations with DFT, you'd supply {'cosmo': "cosmo"}. """

        title = title if title is not None else "{} {} {}".format(
            re.sub(r"\s", "", mol.formula), theory, operation)

        charge = charge if charge is not None else mol.charge
        nelectrons = - charge + mol.charge + mol.nelectrons
        if spin_multiplicity is not None:
            spin_multiplicity = spin_multiplicity
            if (nelectrons + spin_multiplicity) % 2 != 1:
                raise ValueError(
                    "Charge of {} and spin multiplicity of {} is"
                    " not possible for this molecule".format(
                        charge, spin_multiplicity))
        elif charge == mol.charge:
            spin_multiplicity = mol.spin_multiplicity
        else:
            spin_multiplicity = 1 if nelectrons % 2 == 0 else 2

        elements = set(mol.composition.get_el_amt_dict().keys())
        if isinstance(basis_set, str):
            basis_set = {el: basis_set for el in elements}

        basis_set_option = basis_set_option

        return NwTask(charge, spin_multiplicity, basis_set,
                      basis_set_option=basis_set_option,
                      title=title, theory=theory, operation=operation,
                      theory_directives=theory_directives,
                      alternate_directives=alternate_directives)