Bug Report 2019.1.1: WAAPI Python Client blocks subprocess calls on Windows

Question

Thanks for the awesome waapi-client. It makes coding using WAAPI a breeze.

I recently bumped into this issue: when calling a WAAPI script through the subprocess module, the child process will never end.

I've fixed it locally by referring to this post:
https://stackoverflow.com/questions/44633458/why-am-i-getting-notimplementederror-with-async-and-await-on-windows

For py3.7+, we only need a one-liner in client.py:

import platform

class WaapiClient(UnsubscribeHandler):
    def __init__(self, url=None, allow_exception=False):
        ...

        # ++++
        if platform.system() == 'Windows':
            asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())
        # ----

        self._loop = asyncio.get_event_loop()

        ...

Hope this will help you guys fix it in the upstream soon.