Conditional with statement in Python

Question

Is there a way to begin a block of code with a with statement, but conditionally?

Something like:

if needs_with():
    with get_stuff() as gs:

# do          


        

Answer 1

It was hard to find @farsil's nifty Python 3.3 one-liner, so here it is in its own answer:

with ExitStack() if not needs_with() else get_stuff() as gs:
     # do stuff

Note that ExitStack should come first, otherwise get_stuff() will be evaluated.