Martin Panter added the comment:
I was making an analogy between how the “raise” statement works, and how the
throw() method could work. In this example, there are three exception objects
(MainError, SubError, and ValueError). I was suggesting that it is okay for the
context to be set to the MainError instance, because that is how the analogous
version using a “raise” statement works.
def main():
try:
raise MainError("Context inside generator")
except MainError:
yield # __context__ could be changed to MainError
coro = main()
coro.send(None)
try:
try: raise ValueError("Context outside of generator")
except ValueError: raise SubError()
except SubError as ex:
coro.throw(ex) # __context__ is ValueError
# raise analogy:
try:
try: raise ValueError("Context outside of generator")
except ValueError as ex: raise SubError()
except SubError as ex:
saved = ex # __context__ is ValueError
try:
raise MainError("Context inside generator")
except MainError:
raise saved # Changes __context__ to MainError
===
Sorry I’m not really familiar with the code to quickly propose a patch or
review your change though.
----------
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<http://bugs.python.org/issue25612>
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