As a contrived example:

myset = set(['a', 'b', 'c', 'd'])
mydict = {item: (yield ''.join([item, 's'])) for item in myset}

and list(mydict) gives:

['as', 'cs', 'bs', 'ds', {'a': None, 'b': None, 'c': None, 'd': None}]

What happens here? What does yield do? And is this behavior consistent no matter what expression follows yield?

Note: I know that doing mydict = {item: ''.join([item, 's']) for item in myset} would give the dictionary {'a': 'as', 'b': 'bs', 'c': 'cs', 'd': 'ds'}, which seems to be what I am trying to do here.

python generator yield
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