Boilerplate code for iscoroutinefunction() to detect `async def`s

micropython-python-coroutine.py

# $ micropython -m upip install micropython-inspect

try:  # python 3.5+
    from inspect import iscoroutinefunction
    import asyncio
except ImportError:  # micropython 1.8+
    from inspect import isgeneratorfunction
    import uasyncio as asyncio  
    def iscoroutinefunction(func):
        return isgeneratorfunction(func) or repr(func).startswith('<closure <generator')