If the room temperature doesn't drop below 75 F you can ditch the heat lamp and use a Under Tank Heater. (UTH) Heat bulbs are bad for humidity. UTH's don't effect humidity, but require a thermostat to control them and probed thermometers to monitor them.
That had some really useful information, I just learned a lot from that! But if UTH's just heat the bottom of the tank, isn't ambient temperature what you're shooting for when creating a hot side for your python?