[compat] use instance of the class to have a real instance method (closes: #79268)

Details:

By using `klass` instead of an instance of the class, we bounded the method
as a class method.

During execution, the monkey-patched method considered `self` as a reference
to the class and further use of `self` failed miserably.

1 files changed, 2 insertions, 1 deletions

diff --git a/compat.py b/compat.py
index 47ef25c..8983ece 100644
--- a/compat.py
+++ b/compat.py
@@ -63,7 +63,8 @@ except AttributeError:
 # See also http://bugs.python.org/issue11776
 if sys.version_info[0] == 3:
     def method_type(callable, instance, klass):
-        return types.MethodType(callable, klass)
+        # api change. klass is no more considered
+        return types.MethodType(callable, instance)
 else:
     # alias types otherwise
     method_type = types.MethodType