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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 save_session(self, outfolder, override=None):
 """Saves a PyMOL session file."""

        filename = '%s_%s' % (self.protname.upper(), "_".join(
            [self.hetid, self.plcomplex.chain, self.plcomplex.position]))
        if override is not None:
            filename = override
        cmd.save("/".join([outfolder, "%s.pse" % filename]))