Don't show type checker functions in TypeChecker reprs.

jsonschema/_types.py

@@ -61,7 +61,7 @@ def is_any(checker, instance):
     return True
 
 
-@attr.s(frozen=True)
+@attr.s(frozen=True, repr=False)
 class TypeChecker:
     """
     A :kw:`type` property checker.
@@ -89,6 +89,10 @@ class TypeChecker:
         converter=_typed_pmap_converter,
     )
 
+    def __repr__(self):
+        types = ", ".join(repr(k) for k in sorted(self._type_checkers))
+        return f"<{self.__class__.__name__} types={{{types}}}>"
+
     def is_type(self, instance, type: str) -> bool:
         """
         Check if the instance is of the appropriate type.

jsonschema/tests/test_types.py

@@ -105,6 +105,10 @@ def raises_keyerror(checker, instance):
 
         self.assertIs(context.exception, error)
 
+    def test_repr(self):
+        checker = TypeChecker({"foo": is_namedtuple, "bar": is_namedtuple})
+        self.assertEqual(repr(checker), "<TypeChecker types={'bar', 'foo'}>")
+
 
 class TestCustomTypes(TestCase):
     def test_simple_type_can_be_extended(self):