Await an async function in Python debugger

问题

Is it possible to await arbitrary calls to an async function when inside a Python debugger?

Say I have the following code in some main.py file:

import asyncio

async def bar(x):
    return x + 1

async def foo():
    import ipdb; ipdb.set_trace()

asyncio.run(foo())

Now I want to test calling bar() with some argument inside the debugger to test the results. The following happens:

$ python3 main.py
> /Users/user/test/main.py(8)foo()
      7     import ipdb; ipdb.set_trace()
----> 8     return None
      9

ipdb> bar(1)
<coroutine object bar at 0x10404ae60>
main.py:1: RuntimeWarning: coroutine 'bar' was never awaited
  import asyncio
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
ipdb> await bar(1)
*** SyntaxError: 'await' outside function

Of course, I can get around this by having x = await bar(1) above my ipdb.set_trace(), and then inspecting the results, but then I can't try calling my functions in real time while the debugger is active.

回答1:

Seems like there's starting to be more support for this feature since Python 3.8. In particular, look at this issue bpo-37028

If you're still on Python 3.7, maybe aiomonitor could have something that supports this feature to a certain extent.

来源：https://stackoverflow.com/questions/57532678/await-an-async-function-in-python-debugger