Replace pkg_resources with importlib.metadata

As of setuptools 68.0.0, the entire pkg_resources library
is deprecated.  Switch away from pkg_resources.iter_entry_points
and instead use importlib.metadata.entry_points(), which
provides the same information in a slightly different format.

Closes #203
Signed-off-by: Chris Lalancette <clalancette@gmail.com>
Co-authored-by: Ian Stapleton Cordasco <graffatcolmingov@gmail.com>

Author: clalancette

.pre-commit-config.yaml

@@ -1,6 +1,7 @@
 # To enable this pre-commit hook run:
 # `pip install pre-commit` or `brew install pre-commit`
 # Then run `pre-commit install`
+exclude: 'tests\/test_cases'
 
 # Learn more about this config here: https://pre-commit.com/
 repos:
@@ -32,7 +33,7 @@ repos:
     rev: v3.20.0
     hooks:
     - id: pyupgrade
-      args: [--py37-plus]
+      args: [--py39-plus]
 
   - repo: https://github.com/PyCQA/isort
     rev: 6.0.1
@@ -43,7 +44,6 @@ repos:
     rev: 25.1.0
     hooks:
     - id: black
-      exclude: 'tests/test_cases'
 
   # - repo: https://github.com/pre-commit/mirrors-mypy
   #   rev: v1.16.0

flake8_import_order/styles.py

@@ -1,7 +1,6 @@
+import importlib.metadata
 from collections import namedtuple
 
-from pkg_resources import iter_entry_points
-
 from flake8_import_order import ClassifiedImport
 from flake8_import_order import ImportType
 from flake8_import_order import NewLine
@@ -10,16 +9,18 @@
 
 
 def list_entry_points():
-    return iter_entry_points("flake8_import_order.styles")
+    entry_points = importlib.metadata.entry_points()
+    if not hasattr(entry_points, "select"):
+        return entry_points.get("flake8_import_order.styles", [])
+    return entry_points.select(group="flake8_import_order.styles")
 
 
 def lookup_entry_point(name):
-    try:
-        return next(
-            iter_entry_points("flake8_import_order.styles", name=name)
-        )
-    except StopIteration:
-        raise LookupError(f"Unknown style {name}")
+    for style in list_entry_points():
+        if style.name == name:
+            return style
+
+    raise LookupError(f"Unknown style {name}")
 
 
 class Style:
@@ -88,9 +89,9 @@ def _check_I100(self, previous_import, current_import):  # noqa: N802
                 message = f"{message} and in a different group."
             yield Error(current_import.lineno, "I100", message)
 
-    def _check_I201(
+    def _check_I201(  # noqa: N802
         self, previous_import, previous, current_import
-    ):  # noqa: N802,E501
+    ):
         same_section = self.same_section(previous_import, current_import)
         has_newline = isinstance(previous, NewLine)
         if not same_section and not has_newline:
@@ -105,9 +106,9 @@ def _check_I201(
                 ),
             )
 
-    def _check_I202(
+    def _check_I202(  # noqa: N802
         self, previous_import, previous, current_import
-    ):  # noqa: N802,E501
+    ):
         same_section = self.same_section(previous_import, current_import)
         has_newline = isinstance(previous, NewLine)
         if same_section and has_newline:
@@ -207,9 +208,9 @@ def import_key(import_):
 class Edited(Smarkets):
     accepts_application_package_names = True
 
-    def _check_I202(
+    def _check_I202(  # noqa: N802
         self, previous_import, previous, current_import
-    ):  # noqa: N802,E501
+    ):
         same_section = self.same_section(previous_import, current_import)
         has_newline = isinstance(previous, NewLine)
         optional_split = (

setup.cfg

@@ -60,7 +60,10 @@ ignore = tox.ini
 [flake8]
 exclude = .tox,*.egg,tests/test_cases/
 select = E,W,F,N,I
+ignore = W503
 application-import-names = flake8_import_order,tests
+max-line-length = 88
+max-complexity = 10
 
 [coverage:run]
 source = flake8_import_order

tests/test_stdlib.py

@@ -1,8 +1,12 @@
 import ast
 
+# isort: off
 import pycodestyle
+
 import pytest
 
+# isort: on
+
 from flake8_import_order import STDLIB_NAMES
 from flake8_import_order.checker import ImportOrderChecker
 

tox.ini

@@ -15,7 +15,7 @@ deps =
     flake8
     flake8-import-order
     pep8-naming
-commands = flake8 --ignore=W503 --max-line-length=88 --max-complexity=10 flake8_import_order/ tests/
+commands = flake8 flake8_import_order/ tests/
 
 [testenv:setuppy]
 deps =