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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 setup(self, phase, entry_pressure='', pore_volume='', throat_volume=''):
 r""" Set up the required parameters for the algorithm Parameters phase : OpenPNM Phase object The phase to be injected into the Network. The Phase must have the capillary entry pressure values for the system. entry_pressure : string The dictionary key to the capillary entry pressure. If none is supplied then the current value is retained. The default is 'throat.capillary_pressure'. pore_volume : string The dictionary key to the pore volume. If none is supplied then the current value is retained. The default is 'pore.volume'. throat_volume : string The dictionary key to the throat volume. If none is supplied then the current value is retained. The default is 'throat.volume'. """

        self.settings['phase'] = phase.name
        if pore_volume:
            self.settings['pore_volume'] = pore_volume
        if throat_volume:
            self.settings['throat_volume'] = throat_volume
        if entry_pressure:
            self.settings['entry_pressure'] = entry_pressure

        # Setup arrays and info
        self['throat.entry_pressure'] = phase[self.settings['entry_pressure']]
        # Indices into t_entry giving a sorted list
        self['throat.sorted'] = sp.argsort(self['throat.entry_pressure'], axis=0)
        self['throat.order'] = 0
        self['throat.order'][self['throat.sorted']] = sp.arange(0, self.Nt)
        self['throat.invasion_sequence'] = -1
        self['pore.invasion_sequence'] = -1
        self._tcount = 0