'Calls the ``get_{{ table_name }}_data`` methods for each table class.
When returning, the loaded data is set on the tables.'

def load_table_data(self):

    if (not self._table_data_loaded):
        for (table_name, table) in self._tables.items():
            func_name = ('get_%s_data' % table_name)
            data_func = getattr(self, func_name, None)
            if (data_func is None):
                cls_name = self.__class__.__name__
                raise NotImplementedError(('You    must    define    a    %(func_name)s    method    on    %(cls_name)s.' % {'func_name': func_name, 'cls_name': cls_name}))
            table.data = data_func()
            table._meta.has_prev_data = self.has_prev_data(table)
            table._meta.has_more_data = self.has_more_data(table)
        self._table_data_loaded = True
