I need to convert (0, 128, 64) to something like this #008040. I'm not sure what to call the latter, making searching difficult.
Use the format operator %
:
>>> '#%02x%02x%02x' % (0, 128, 64)
'#008040'
Note that it won't check bounds...
>>> '#%02x%02x%02x' % (0, -1, 9999)
'#00-1270f'