inspect.signature: Check for function-like objects before builtins. Issue #17159

1 files changed, 4 insertions, 4 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index b85fbcc..c7a2cf8 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1911,15 +1911,15 @@ def _signature_internal(obj, follow_wrapper_chains=True, skip_bound_arg=True):
 
             return sig.replace(parameters=new_params)
 
-    if _signature_is_builtin(obj):
-        return _signature_from_builtin(Signature, obj,
-                                       skip_bound_arg=skip_bound_arg)
-
     if isfunction(obj) or _signature_is_functionlike(obj):
         # If it's a pure Python function, or an object that is duck type
         # of a Python function (Cython functions, for instance), then:
         return Signature.from_function(obj)
 
+    if _signature_is_builtin(obj):
+        return _signature_from_builtin(Signature, obj,
+                                       skip_bound_arg=skip_bound_arg)
+
     if isinstance(obj, functools.partial):
         wrapped_sig = _signature_internal(obj.func,
                                           follow_wrapper_chains,