GH-63062: Implement __subclasshook__() for Finders and Loaders in abc lib

Lib/importlib/_abc.py

@@ -20,6 +20,14 @@ def create_module(self, spec):
     # We don't define exec_module() here since that would break
     # hasattr checks we do to support backward compatibility.
 
+    @classmethod
+    def __subclasshook__(cls, C):
+        if cls is Loader:
+            if (any('exec_module' in B.__dict__ for B in C.__mro__) or
+                any('load_module' in B.__dict__ for B in C.__mro__)):
+                return True
+        return NotImplemented
+
     def load_module(self, fullname):
         """Return the loaded module.
 

Lib/importlib/abc.py

@@ -86,6 +86,14 @@ class ResourceLoader(Loader):
 
     """
 
+    @classmethod
+    def __subclasshook__(cls, C):
+        if cls is ResourceLoader:
+            if (Loader.__subclasshook__(C) and
+                any('get_data' in B.__dict__ for B in C.__mro__)):
+                return True
+        return NotImplemented
+
     @abc.abstractmethod
     def get_data(self, path):
         """Abstract method which when implemented should return the bytes for
@@ -102,11 +110,24 @@ class InspectLoader(Loader):
 
     """
 
+    @classmethod
+    def __subclasshook__(cls, C):
+        if cls is InspectLoader:
+            if (Loader.__subclasshook__(C) and
+                any('is_package' in B.__dict__ for B in C.__mro__) and
+                any('get_code' in B.__dict__ for B in C.__mro__) and
+                any('get_source' in B.__dict__ for B in C.__mro__) and
+                any('source_to_code' in B.__dict__ for B in C.__mro__)):
+                return True
+        return NotImplemented
+
     def is_package(self, fullname):
-        """Optional method which when implemented should return whether the
-        module is a package.  The fullname is a str.  Returns a bool.
+        """(abstract) Return whether the module is a package.
+
+        The fullname is a str.
 
         Raises ImportError if the module cannot be found.
+
         """
         raise ImportError
 

Misc/NEWS.d/next/Library/2023-03-17-09-53-23.gh-issue-63062.0gwxz6.rst

@@ -0,0 +1 @@
+__subclasshook__() implemented  for the Finders and Loaders In the abc lib. Patched by Furkan Onder and Eric Snow.