TypeError: 'type' object is not subscriptable

OS: ubuntu 20.04 python ver.: 3.8 ue4-docker: 0.0.97

ue4-docker info
/usr/lib/python3/dist-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.9) or chardet (3.0.4) doesn't match a supported version!
  warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
Traceback (most recent call last):
  File "/usr/local/bin/ue4-docker", line 5, in <module>
    from ue4docker import main
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/__init__.py", line 1, in <module>
    from .build import build
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/build.py", line 2, in <module>
    from .infrastructure import *
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/infrastructure/__init__.py", line 7, in <module>
    from .ImageBuilder import ImageBuilder
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/infrastructure/ImageBuilder.py", line 11, in <module>
    class ImageBuilder(object):
  File "/usr/local/lib/python3.8/dist-packages/ue4docker/infrastructure/ImageBuilder.py", line 143, in ImageBuilder
    env: Optional[dict[str, str]] = None,
TypeError: 'type' object is not subscriptable

Some strange error

[slonopotamus]

Whoops. Fixed and released as ue4-docker 0.0.98.

[TBBle]

Interesting. We build and publish packages with Python 3.7, but don’t currently run a linter that would catch this. A trivial search shows a few mypy and multi-linter GitHub Actions, perhaps we could trivially drop one of those into CI? That’s assuming they’d actually pick up something like this; mypy is just my first guess since it’s the tool that I know checks and consumes those annotations, although to be honest I haven’t ever run it myself.