Nick Coghlan added the comment:
I think there's a strong case for a generic __frame__ attribute, since there
are plenty of useful things you can do given "object with a linked frame" as a
protocol (like extract the current locals namespace). We may even want to
include traceback objects in that particular attribute access consolidation
(since they have a tb_frame attribute).
Looking at the way inspect.getgeneratorstate() and inspect.getcoroutinestate()
are implemented, I also think there may be a case for consolidating
`[gi|cr|ag]_running` into a single `__running__` attribute, such that for
objects that provide a `__frame__` attribute:
* `__running__` doesn't exist -> not an asynchronous operation
* `__running__ = True` -> running asynchronous operation
* `__running__ = False` -> paused or halted asynchronous operation
Then, rather than adding an inspect API specifically for async generators, we
could add a general "inspect.getasyncstate()" one that covered all the object
types, with the possible states:
ASYNC_RUNNING: __running__ == True, assert __frame__ is not None
ASYNC_CREATED: __running__ == False, __frame__.f_lasti == -1
ASYNC_CLOSED: __running__ == False, __frame__ is None
ASYNC_SUSPENDED: __running__ == False, neither closed nor created
Properly interpreting `gi_yieldfrom` and `[cr|ag]_await` is a bit trickier,
since they require additional knowledge of how the control flow for those
objects actually work. However, if we run with the "async operation
introspection protocol" idea, then a suitably generic name would be
`__async_call__`, and we could make it a doubly-linked list for the coroutine
and async generator case by setting an `__async_return__` attribute on the
target (to say where we expect control to return to when we're done).
----------
nosy: +yselivanov
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31230>
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