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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 monkhorst_automatic(cls, structure, ngkpt, use_symmetries=True, use_time_reversal=True, chksymbreak=None, comment=None):
 """ Convenient static constructor for an automatic Monkhorst-Pack mesh. Args: structure: :class:`Structure` object. ngkpt: Subdivisions N_1, N_2 and N_3 along reciprocal lattice vectors. use_symmetries: Use spatial symmetries to reduce the number of k-points. use_time_reversal: Use time-reversal symmetry to reduce the number of k-points. Returns: :class:`KSampling` object. """

        sg = SpacegroupAnalyzer(structure)
        #sg.get_crystal_system()
        #sg.get_point_group_symbol()
        # TODO
        nshiftk = 1
        #shiftk = 3*(0.5,) # this is the default
        shiftk = 3*(0.5,)

        #if lattice.ishexagonal:
        #elif lattice.isbcc
        #elif lattice.isfcc

        return cls.monkhorst(
            ngkpt, shiftk=shiftk, use_symmetries=use_symmetries, use_time_reversal=use_time_reversal,
            chksymbreak=chksymbreak, comment=comment if comment else "Automatic Monkhorst-Pack scheme")