style95 commented on pull request #5033:
URL: https://github.com/apache/openwhisk/pull/5033#issuecomment-744015539
It seems flake8 is failed to run.
```
Flake8: first round (fast fail) stops the build if there are any Python 3
syntax errors...
Traceback (most recent call last):
File "/home/travis/.local/bin/flake8", line 7, in <module>
from flake8.main.cli import main
File "/home/travis/.local/lib/python3.5/site-packages/flake8/main/cli.py",
line 5, in <module>
from flake8.main import application
File
"/home/travis/.local/lib/python3.5/site-packages/flake8/main/application.py",
line 11, in <module>
from flake8 import checker
File "/home/travis/.local/lib/python3.5/site-packages/flake8/checker.py",
line 18, in <module>
from flake8 import processor
File
"/home/travis/.local/lib/python3.5/site-packages/flake8/processor.py", line 13,
in <module>
from flake8 import utils
File "/home/travis/.local/lib/python3.5/site-packages/flake8/utils.py",
line 16, in <module>
from flake8._compat import lru_cache
File "/home/travis/.local/lib/python3.5/site-packages/flake8/_compat.py",
line 12, in <module>
import importlib_metadata
File
"/home/travis/.local/lib/python3.5/site-packages/importlib_metadata/__init__.py",
line 43, in <module>
class PackageNotFoundError(ModuleNotFoundError):
NameError: name 'ModuleNotFoundError' is not defined
```
`importlib_metadata` has changed to submodule(`importlib.metadata`) since
python3.8 and I suspect there are some issues in the flake8 though we are using
python3.5 in Travis.
I think we can try to use python3.8 to clarify the issue.
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