refactor: use importlib instead of pkg_resources (#738)

pyproject.toml

@@ -38,6 +38,7 @@ dependencies=[
     "biocommons.seqrepo >= 0.6.5",
     "bioutils >= 0.4.0,<1.0",
     "configparser >= 3.3.0",
+    "importlib_resources",
     "ipython",
     "parsley",
     "psycopg2",

src/hgvs/__init__.py

@@ -53,8 +53,7 @@
 import re
 import sys
 import warnings
-
-import pkg_resources
+from importlib import metadata
 
 from .config import global_config  # noqa (importing symbol)
 
@@ -71,11 +70,11 @@
 
 _is_released_version = False
 try:
-    __version__ = pkg_resources.get_distribution("hgvs").version
+    __version__ = metadata.version("hgvs")
     # TODO: match other valid release tags, like .post\d+
     if re.match(r"^\d+\.\d+\.\d+$", __version__) is not None:
         _is_released_version = True
-except pkg_resources.DistributionNotFound:
+except metadata.PackageNotFoundError:
     warnings.warn("can't get __version__ because %s package isn't installed" % __package__, Warning)
     __version__ = None
 

src/hgvs/config.py

@@ -31,8 +31,10 @@
 import re
 from configparser import ConfigParser, ExtendedInterpolation
 from copy import copy
-
-from pkg_resources import resource_stream
+try:
+    from importlib.resources import files as resources_files
+except ImportError:
+    from importlib_resources import files as resources_files
 
 logger = logging.getLogger(__name__)
 
@@ -53,7 +55,7 @@ def __init__(self, extended_interpolation=True):
 
     def read_stream(self, flo):
         """read configuration from ini-formatted file-like object"""
-        self._cp.read_string(flo.read().decode("ascii"))
+        self._cp.read_string(flo.open("rb").read().decode("ascii"))
 
     def __copy__(self):
         new_config = Config.__new__(Config)
@@ -116,6 +118,6 @@ def _val_xform(v):
 
 
 _default_config = Config()
-_default_config.read_stream(resource_stream(__name__, "_data/defaults.ini"))
+_default_config.read_stream(resources_files(__package__) / "_data" / "defaults.ini")
 
 global_config = copy(_default_config)

tests/test_hgvs_grammar_full.py

@@ -4,8 +4,10 @@
 import re
 import unittest
 from sys import version_info
-
-import pkg_resources
+try:
+    from importlib.resources import files as resources_files
+except ImportError:
+    from importlib_resources import files as resources_files
 
 #
 # Tests of the grammar
@@ -52,7 +54,7 @@ def test_parser_test_completeness(self):
         """ensure that all rules in grammar have tests"""
 
         grammar_rule_re = re.compile(r"^(\w+)")
-        grammar_fn = pkg_resources.resource_filename("hgvs", "_data/hgvs.pymeta")
+        grammar_fn = resources_files("hgvs") / "_data" / "hgvs.pymeta"
         with open(grammar_fn, "r") as f:
             grammar_rules = set(r.group(1) for r in filter(None, map(grammar_rule_re.match, f)))