fixed honoring custom repr for NamedTuple if assigned by partialmethod

IPython/core/tests/test_formatters.py

@@ -529,3 +529,18 b' def test_repr_mime_failure():'
     obj = BadReprMime()
     d, md = f.format(obj)
     assert "text/plain" in d
+
+
+def test_custom_repr_namedtuple_partialmethod():
+    from functools import partialmethod
+    from typing import NamedTuple
+    
+    class Foo(NamedTuple):
+        ...
+
+    Foo.__repr__ = partialmethod(lambda obj: "Hello World")
+    foo = Foo()
+    
+    f = PlainTextFormatter()
+    assert f.pprint
+    assert f(foo) == "Hello World"

IPython/lib/pretty.py

@@ -406,8 +406,7 b' class RepresentationPrinter(PrettyPrinter):'
                             meth = cls._repr_pretty_
                             if callable(meth):
                                 return meth(obj, self, cycle)
-                        if cls is not object \
-                                and callable(cls.__dict__.get('__repr__')):
+                        if cls is not object and callable(getattr(cls, '__repr__', None)):
                             return _repr_pprint(obj, self, cycle)
 
             return _default_pprint(obj, self, cycle)