Suppose that you have the Python try:/finally: problem and need to get around it, specificallyyou need to both be a generator and have your finally: runimmediately. Taken from here ,one answer is:

def foo(bar):  try:    def output():      ... compute with bar ...        yield res      ...    return output()  finally:    print "finalizing"

(Now, there is a lot of things that this doesn't help with; the actualcomputation

Due to another entry I'm in the process of writing, I was suddenlystruck with a question: in Python, when does the code in a generatorfunction start running?

First, the brief version of generators and iterators. To handwavesomewhat, a generator is a function that uses yield to create andreturn its results one at a time. Behind the scenes, such a functionactually returns an iterator object, which the Python interpreter usesto freeze and unfreeze the actual code as the function's code calls