I recently had need to write the following code:
def compileOuter(self):
if False: yield None
else: return
"compileOuter" is a generator function which is implemented in
various classes. In this particular class, it always yields nothing.
However, none of the following work:
def compileOuter(self):
return
def compileOuter(self):
pass
def compileOuter(self):
yield
The first two don't work because in order to define a generator, you
must have a yield statement inside it. The last doesn't work because
every "yield" must have an argument.
I've been using "return" in generators ever since I started using
generators, but on reflection, it seems to me that such a thing is in
some ways inconsistent; "return" is (conceptually, at least
originally) a function statement, where "return" by itself really
stands in for "return None". But in generators, it is being used as a
control flow command. For example, you can't have "return" with an
argument inside a generator.
Too bad "return" wasn't entirely forbidden within generators, and
"yield" without an argument mandated instead. Oh well, too let now I
suppose...
Cheers,
Ken
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