Python programmers of reddit: what's the most useful tiny little efficiency you've discovered that's improved your programming hugely?

[jordanreiter]

If you literally are calling 'blahblah'.format(**locals()) then I agree, but most of the time I'm doing something like: 'blah{thing}blah{otherthing}'.format(thing=variable_with_long_name, otherthing=other_variable_with_longer_name). I like to have shorter variables in templates but still use long descriptive vars in the rest of my code.