the way to make an (aysnc)generator that immediately raises
Stop(Async)Iteration immediately is to insert an unreachable `yield` statement,
however there's two ways to do it:
def example():
if False:
yield
or:
def example():
return
yield
currently test_asyncgen.py uses both, eg:
@types.coroutine
def __anext__(self):
if False:
yield "this is a generator-based coroutine"
if self.yielded >= 2:
raise StopAsyncIteration()
else:
self.yielded += 1
return self.yielded
or:
async def agenfn():
try:
await _async_yield(1)
except MyError:
await _async_yield(2)
return
yield
the `if False: yield` version has a disadvantage in that it can be anywhere in
the function, if this one is chosen then an additional caveat is that it should
be the first two statements in a function
if `return; yield` version has an disadvantage in that the unreachable yield
could be inserted after any `return`, if this one is chosen then an additional
caveat is that it should be the last two statements in a function and de-dented
as much as syntactically possible.
Which alternative do you prefer? I prefer `return; yield`
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