[Python-Dev] iscoroutinefunction vs. coroutines (original) (raw)

Matthias Urlichs smurf at noris.de
Thu Mar 9 06:04:40 EST 2017

Hi,

Is this pattern

def foo():
    return bar()
async def bar():
    await <whatever>

async def async_main():
    await foo()

considered to be valid?

The reason I'm asking is that some code out there likes to accept a might-be-a-coroutine-function argument, using

def run_callback(fn):
    if iscoroutinefunction(fn):
        res = await fn()
    else:
        res = fn()

instead of

def run_callback(fn):
    res = fn()
    if iscoroutine(res):
        res = await res()

The former obviously breaks when somebody combines these idioms and calls

run_callback(foo)

but I can't help but wonder whether the latter use might be deprecated, or even warned about, in the future and/or with non-CPython implementations.

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