Bug - python3.8 some imports which are using metadata module doesn't work #807

After upgrading to python3.8 I've started to encounter a strange error, when I'm importing some modules (for example jsonschema) I'm getting a importlib.metadata.PackageNotFoundError.
And when using vanilla python shell everything is working fine.

`bpython3 -p (echo 'import jsonschema' | psub )
bpython version 0.18 on top of Python 3.8.2 /usr/bin/python3

import jsonschema
Traceback (most recent call last):
File "", line 1, in
import jsonschema
File "/usr/lib/python3/dist-packages/bpython/curtsiesfrontend/repl.py", line 243, in load_module
module = self.loader.load_module(name)
File "/usr/local/lib/python3.8/dist-packages/jsonschema/init.py", line 34, in
version = metadata.version("jsonschema")
File "/usr/lib/python3.8/importlib/metadata.py", line 531, in version
return distribution(distribution_name).version
File "/usr/lib/python3.8/importlib/metadata.py", line 504, in distribution
return Distribution.from_name(distribution_name)
File "/usr/lib/python3.8/importlib/metadata.py", line 177, in from_name
raise PackageNotFoundError(name)
importlib.metadata.PackageNotFoundError: jsonschema`

python3 -i (echo 'import jsonschema; print("ok")' | psub ) ok