Document and test the resolution of issue 3445 (tolerate missing attributes in functools.update_wrapper, previously implemented as a side effect of the __annotations__ copying patch) and implement issue 9567 (add a __wrapped__ attribute when using update_wrapper)
diff --git a/Lib/functools.py b/Lib/functools.py
index c2c2282..bd1334b 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -38,9 +38,14 @@
are updated with the corresponding attribute from the wrapped
function (defaults to functools.WRAPPER_UPDATES)
"""
+ wrapper.__wrapped__ = wrapped
for attr in assigned:
- if hasattr(wrapped, attr):
- setattr(wrapper, attr, getattr(wrapped, attr))
+ try:
+ value = getattr(wrapped, attr)
+ except AttributeError:
+ pass
+ else:
+ setattr(wrapper, attr, value)
for attr in updated:
getattr(wrapper, attr).update(getattr(wrapped, attr, {}))
# Return the wrapper so this can be used as a decorator via partial()