I could easily see using all of the examples; I run into this pretty regularly.
What about something like the following (which, honestly is really a
combination of other examples).
If I have a function that has multiple parameters, each of which might be
expensive, but it might break out earlier depending on how each one is
evaluated... for example:
(pretending that "$" is a flag that says "evaluate later", and $(arg) is how
you say "evaluate now")
def combine_unless_none(*$args, sep=', '):
""" if any arg evaluates to None, return '', otherwise join"""
for arg in args:
tmp_arg = $(arg)
If tmp_arg is None: