gh-121027: Add a future warning in functools.partial.__get__ (#121086)

1 files changed, 11 insertions, 1 deletions

diff --git a/Lib/functools.py b/Lib/functools.py
index 3d0fd66..d04957c 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -311,6 +311,16 @@ class partial:
         args.extend(f"{k}={v!r}" for (k, v) in self.keywords.items())
         return f"{module}.{qualname}({', '.join(args)})"
 
+    def __get__(self, obj, objtype=None):
+        if obj is None:
+            return self
+        import warnings
+        warnings.warn('functools.partial will be a method descriptor in '
+                      'future Python versions; wrap it in staticmethod() '
+                      'if you want to preserve the old behavior',
+                      FutureWarning, 2)
+        return self
+
     def __reduce__(self):
         return type(self), (self.func,), (self.func, self.args,
                self.keywords or None, self.__dict__ or None)
@@ -392,7 +402,7 @@ class partialmethod(object):
     def __get__(self, obj, cls=None):
         get = getattr(self.func, "__get__", None)
         result = None
-        if get is not None:
+        if get is not None and not isinstance(self.func, partial):
             new_func = get(obj, cls)
             if new_func is not self.func:
                 # Assume __get__ returning something new indicates the