[Tutor] continuous running of a method

[Greg Bair]

I have a method (I'll call it foo) that will either return None or an 
object depending on a random value generated.  What I want to happen is 
that if I call foo(), i.e, f = foo() and it returns None, to re-call it 
until it returns something else.  I would think this would be done with 
a while loop, but can't seem to get the details right.

Any help would be greatly appreciated.
Greg
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