Replace pkg_resources with importlib_metadata

[jorenretel]

Hi,

first of all, thanks for this great library. I just ran into this warning all the time about pkg_resources being deprecated when in favour of importlib.metadata.

In this pull request I replaces pas_resources with importlib_metadata: https://docs.python.org/3/library/importlib.metadata.html , this is a back port for Importlib.metadata which is only in the standard library since python 3.8. By explicitly using importlib_metadata, older versions of python 3 are also still supported by NCLS. An alternative would be for NCLS to stop supporting python versions older than 3.8 and use the importlib.metadata from the standard library.

[endrebak]

I'll have a look at this tomorrow, thanks :D

[sstrong99]

I'm getting an error that might be fixed by this PR:

...
  File "/usr/local/lib/python3.8/dist-packages/TFEA/rank.py", line 1370, in meta_profile_bg
    from ncls import NCLS
  File "/usr/local/lib/python3.8/dist-packages/ncls/__init__.py", line 2, in <module>
    import pkg_resources
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3254, in <module>
    def _initialize_master_working_set():
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3237, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 3266, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 575, in _build_master
    ws = cls()
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 568, in __init__
    self.add_entry(entry)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 624, in add_entry
    for dist in find_distributions(entry, True):
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1970, in find_distributions
    importer = get_importer(path_item)
  File "/usr/lib/python3.8/pkgutil.py", line 419, in get_importer
    importer = path_hook(path_item)
  File "<frozen importlib._bootstrap_external>", line 1594, in path_hook_for_FileFinder
  File "<frozen importlib._bootstrap_external>", line 1469, in __init__
  File "<frozen importlib._bootstrap_external>", line 177, in _path_isabs
AttributeError: 'PosixPath' object has no attribute 'startswith'

have you guys seen that before? and do you know if there's a workaround?

[jorenretel]

Hi @sstrong99 ,

sorry for replying late on this. The problem you are having is not caused by NCLS, but by a bug in python: https://bugs.python.org/issue44061 . I think making a fresh and new python environment might solve your problem.

I think this PR might also solve the problem (but somewhat as a side effect).

[y9c]

Same issues for python 3.12.