I thought of something similar, but where the dict-literal construction is
desired:
>>> foo = True
>>> bar = False
>>> baz = False
>>> d = {
... 'foo' if foo else None: 1,
... 'bar' if bar else None: 2,
... 'baz' if baz else None: 3,
... }
>>> d
{'foo': 1, None: 3}
>>> d.pop(None)
3
>>> d
{'foo': 1}
The natural helper function for the "'foo' if foo else None" snip would then be
something like:
>>> def key_flag(key, flag, default=None):
... return key if flag else default
...
>>> dd = {
... key_flag('foo', foo): 1,
... key_flag('bar', bar): 2,
... key_flag('baz', baz): 3,
... }
>>> dd
{'foo': 1, None: 3}
>>> dd.pop(None)
3
>>> dd
{'foo': 1}
-Brian
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