Move workaround for #327 to _compat module

CHANGES.rst

@@ -1,3 +1,8 @@
+v4.6.3
+======
+
+* Moved workaround for #327 to ``_compat`` module.
+
 v4.6.2
 ======
 

importlib_metadata/__init__.py

@@ -7,7 +7,6 @@
 import email
 import pathlib
 import operator
-import platform
 import textwrap
 import warnings
 import functools
@@ -21,6 +20,7 @@
     NullFinder,
     PyPy_repr,
     install,
+    pypy_partial,
 )
 from ._functools import method_cache
 from ._itertools import unique_everseen
@@ -49,16 +49,6 @@
 ]
 
 
-def _pypy_partial(val):
-    """
-    Adjust for variable stacklevel on partial under PyPy.
-
-    Workaround for #327.
-    """
-    is_pypy = platform.python_implementation() == 'PyPy'
-    return val + is_pypy
-
-
 class PackageNotFoundError(ModuleNotFoundError):
     """The package was not found."""
 
@@ -256,7 +246,7 @@ class DeprecatedList(list):
         warnings.warn,
         "EntryPoints list interface is deprecated. Cast to list if needed.",
         DeprecationWarning,
-        stacklevel=_pypy_partial(2),
+        stacklevel=pypy_partial(2),
     )
 
     def __setitem__(self, *args, **kwargs):
@@ -405,7 +395,7 @@ class Deprecated:
         warnings.warn,
         "SelectableGroups dict interface is deprecated. Use select.",
         DeprecationWarning,
-        stacklevel=_pypy_partial(2),
+        stacklevel=pypy_partial(2),
     )
 
     def __getitem__(self, name):

importlib_metadata/_compat.py

@@ -1,4 +1,5 @@
 import sys
+import platform
 
 
 __all__ = ['install', 'NullFinder', 'PyPy_repr', 'Protocol']
@@ -84,3 +85,13 @@ def make_param(name):
     if affected:  # pragma: nocover
         __repr__ = __compat_repr__
     del affected
+
+
+def pypy_partial(val):
+    """
+    Adjust for variable stacklevel on partial under PyPy.
+
+    Workaround for #327.
+    """
+    is_pypy = platform.python_implementation() == 'PyPy'
+    return val + is_pypy