Thank you Duanes for saving me a lot of typing.
Basement situation:
One (or more) of those short 6 or 8 foot siphon hoses or a homemade version. This will get the water from your tank into a trash barrel/giant bucket (we all have one (or many), right?)
Water pump powerful enough to either push the water from the barrel to the sink, or from the barrel to your lawn. The pump will sit inside the barrel. Note: only worth going to the lawn if your water changes involve a lot of water.
For regulating flow, a python does have an adjustment lever on it. Otherwise, add one or "kink" it.
As for you using the Python as its designed - running the tap to create suction - a horrible waste of water.
I hope this is useful. I am sure there are a lot of DIY water changers in the DIY section.