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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 process_tectonic_regionalisation(self):
        '''
        Processes the tectonic regionalisation from the yaml file
        '''

        if 'tectonic_regionalisation' in self.data.keys():
            tectonic_reg = TectonicRegionalisation()
            tectonic_reg.populate_regions(
                parse_tect_region_dict_to_tuples(
                    self.data['tectonic_regionalisation']))
        else:
            tectonic_reg = None
        return tectonic_reg