def _from_catalog(self):
        """Initialize the dictionary of extensions by querying the catalogs"""
        if self.dbconn.version < 90100:
            return
        for ext in self.fetch():
            self[ext.key()] = ext
dataset/ETHPy150Open perseas/Pyrseas/pyrseas/dbobject/extension.py/ExtensionDict._from_catalog/original