Remove pkg_resources from direct imports

[franz101]

This is a hot fix for the IO read issues caused by using the legacy pkg_resources.iter_entry_points

legacy pkg_resources.iter_entry_points is replaced with importlib.metadata.entry_points

try:
  if sys.version_info[:2] >= (3, 10):
      # pylint: disable=no-name-in-module
      from importlib.metadata import entry_points
  else:
      from importlib_metadata import entry_points
except ImportError:
  import pkg_resources
  entry_points = pkg_resources.iter_entry_points

[franz101]

The discussion of the issue can be found here: https://github.com/vaexio/vaex/issues/2283

[franz101]

@JovanVeljanoski @maartenbreddels

This fixes the reading file error: https://colab.research.google.com/drive/1EG9898VtmO19FwfZKd_LJzqkz_YVWwlE?usp=sharing#scrollTo=S-T0Wjd3B_YU

Here is an example of the fix: https://colab.research.google.com/drive/1HNtACZhFteXlqrpFQR3wGtnPuropRx1j?usp=sharing

The reason is due to pkg_resources unable to find file openers without kernel restart: https://git.smhi.se/climix/climix/-/merge_requests/165/diffs

[maartenbreddels]

Ok, just to make it clear I understand.

• pkg_resources.iter_entry_points is slow
• Python 3.8 has importlib.metadata which is faster
• If on Python < 3.8 and importlib_metadata is installed (it's not a dependency right now) you also get a speedup by not using pkg_resources

[maartenbreddels]

Man, I can't believe this is all so flakey, importlib_metadata==4.0 seems to work, 3.0 doesn't seem to have the groups argument.

[franz101]

Actually it is not about the speed here. In Google colab after a fresh installation without a restart, pkg_resources entrypoints are an empty list. Therefore it won't even try any openers and fail.

I agree can't believe how bad python handles lazy loads and has API changes across releases.

[maartenbreddels]

Many thanks for helping us sort out this mess! :)

[franz101]

its my first large open source project contribution. happy to contribute where I can. ❤️

[maartenbreddels]

Many thanks :)