Fixed a Python 2.6.4 incompatibility
Fixed a Python 2.6.4 incompatibility

kickapoo/enhydris,kickapoo/enhydris,ellak-monades-aristeias/enhydris,openmeteo/enhydris,ellak-monades-aristeias/enhydris,ellak-monades-aristeias/enhydris,aptiko/enhydris,kickapoo/enhydris,openmeteo/enhydris,openmeteo/enhydris,aptiko/enhydris,aptiko/enhydris