[Python] Is it possible to have an optional with/as statement in python?

Instead of this:

file = open(f)
do_something(file)
file.close()


it's better to use this:

with open(f) as file:
do_something(file)


What if I have something like this?

if f is not None:
file = open(f)
else:
file = None
do_something(file)
if file is not None:
file.close()


Where do_something also has an if file is None clause, and still does something useful in that case - I don't want to just skip do_something if file is None.

Is there a sensible way of converting this to with/as form? Or am I just trying to solve the optional file problem in a wrong way?

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