inspect.signature: Add support for decorated (wrapped) builtins #20425

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index fefcddb..f0c1247 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1530,9 +1530,6 @@ def signature(obj):
     if not callable(obj):
         raise TypeError('{!r} is not a callable object'.format(obj))
 
-    if _signature_is_builtin(obj):
-        return Signature.from_builtin(obj)
-
     if isinstance(obj, types.MethodType):
         # In this case we skip the first parameter of the underlying
         # function (usually `self` or `cls`).
@@ -1570,6 +1567,9 @@ def signature(obj):
 
         return sig.replace(parameters=new_params)
 
+    if _signature_is_builtin(obj):
+        return Signature.from_builtin(obj)
+
     if isinstance(obj, types.FunctionType):
         return Signature.from_function(obj)