fix issue #6
fix issue #6


Former-commit-id: a2a69c26f46dfea5b41b14caefcc972b4c346b8f [formerly b36c8938c4bffd0078be8f4e10b3ef618c296de5] [formerly 22432b16c074e7f24d6859774f8d2b403594c185]
Former-commit-id: 820c8d75be633f32d9895d81db910f10f286bf7b
Former-commit-id: bbce71bf934d5a9d51552bf17efbfa337892d47e
DEIB-GECO/PyGMQL,DEIB-GECO/PyGMQL