Switch to importlib-metadata

src/_pytest/assertion/rewrite.py

@@ -64,7 +64,6 @@ class AssertionRewritingHook(object):
         self.session = None
         self.modules = {}
         self._rewritten_names = set()
-        self._register_with_pkg_resources()
         self._must_rewrite = set()
         # flag to guard against trying to rewrite a pyc file while we are already writing another pyc file,
         # which might result in infinite recursion (#3506)
@@ -315,24 +314,6 @@ class AssertionRewritingHook(object):
         tp = desc[2]
         return tp == imp.PKG_DIRECTORY
 
-    @classmethod
-    def _register_with_pkg_resources(cls):
-        """
-        Ensure package resources can be loaded from this loader. May be called
-        multiple times, as the operation is idempotent.
-        """
-        try:
-            import pkg_resources
-
-            # access an attribute in case a deferred importer is present
-            pkg_resources.__name__
-        except ImportError:
-            return
-
-        # Since pytest tests are always located in the file system, the
-        #  DefaultProvider is appropriate.
-        pkg_resources.register_loader_type(cls, pkg_resources.DefaultProvider)
-
     def get_data(self, pathname):
         """Optional PEP302 get_data API.
         """

src/_pytest/config/__init__.py

@@ -12,8 +12,10 @@ import sys
 import types
 import warnings
 
+import importlib_metadata
 import py
 import six
+from packaging.version import Version
 from pluggy import HookimplMarker
 from pluggy import HookspecMarker
 from pluggy import PluginManager
@@ -787,25 +789,17 @@ class Config(object):
         modules or packages in the distribution package for
         all pytest plugins.
         """
-        import pkg_resources
-
         self.pluginmanager.rewrite_hook = hook
 
         if os.environ.get("PYTEST_DISABLE_PLUGIN_AUTOLOAD"):
             # We don't autoload from setuptools entry points, no need to continue.
             return
 
-        # 'RECORD' available for plugins installed normally (pip install)
-        # 'SOURCES.txt' available for plugins installed in dev mode (pip install -e)
-        # for installed plugins 'SOURCES.txt' returns an empty list, and vice-versa
-        # so it shouldn't be an issue
-        metadata_files = "RECORD", "SOURCES.txt"
-
         package_files = (
-            entry.split(",")[0]
-            for entrypoint in pkg_resources.iter_entry_points("pytest11")
-            for metadata in metadata_files
-            for entry in entrypoint.dist._get_metadata(metadata)
+            str(file)
+            for dist in importlib_metadata.distributions()
+            if any(ep.group == "pytest11" for ep in dist.entry_points)
+            for file in dist.files
         )
 
         for name in _iter_rewritable_modules(package_files):
@@ -874,11 +868,10 @@ class Config(object):
 
     def _checkversion(self):
         import pytest
-        from pkg_resources import parse_version
 
         minver = self.inicfg.get("minversion", None)
         if minver:
-            if parse_version(minver) > parse_version(pytest.__version__):
+            if Version(minver) > Version(pytest.__version__):
                 raise pytest.UsageError(
                     "%s:%d: requires pytest-%s, actual pytest-%s'"
                     % (

src/_pytest/outcomes.py

@@ -8,6 +8,8 @@ from __future__ import print_function
 
 import sys
 
+from packaging.version import Version
+
 
 class OutcomeException(BaseException):
     """ OutcomeException and its subclass instances indicate and
@@ -175,15 +177,7 @@ def importorskip(modname, minversion=None, reason=None):
         return mod
     verattr = getattr(mod, "__version__", None)
     if minversion is not None:
-        try:
-            from pkg_resources import parse_version as pv
-        except ImportError:
-            raise Skipped(
-                "we have a required version for %r but can not import "
-                "pkg_resources to parse version strings." % (modname,),
-                allow_module_level=True,
-            )
-        if verattr is None or pv(verattr) < pv(minversion):
+        if verattr is None or Version(verattr) < Version(minversion):
             raise Skipped(
                 "module %r has __version__ %r, required is: %r"
                 % (modname, verattr, minversion),