Support packages that are using the new importlib.metadata api #808
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Fix issue #807 that I've opened.
The bug is as follows:
Some new python3.8 compatible packages are using the new importlib.metadata package instead of the now-old pkg_resources.
it has a new api, and it breaks inside bpython if "self.watcher" isn't None.
(Frankly I didn't invest the time to look what this "self.watcher" is.
I've just added the required api functionality for the imports to work.