BUG: Fix frozenset display in pprint (#60867)

* Fix frozenset display in pprint

It needs to have braces like a set.

* Fix frozenset pprint test

Author: wjandrea

pandas/io/formats/printing.py

@@ -112,7 +112,7 @@ def _pprint_seq(
     if isinstance(seq, set):
         fmt = "{{{body}}}"
     elif isinstance(seq, frozenset):
-        fmt = "frozenset({body})"
+        fmt = "frozenset({{{body}}})"
     else:
         fmt = "[{body}]" if hasattr(seq, "__setitem__") else "({body})"
 

pandas/tests/io/formats/test_printing.py

@@ -83,7 +83,7 @@ def test_repr_mapping(self):
         assert printing.pprint_thing(MyMapping()) == "{'a': 4, 'b': 4}"
 
     def test_repr_frozenset(self):
-        assert printing.pprint_thing(frozenset([1, 2])) == "frozenset(1, 2)"
+        assert printing.pprint_thing(frozenset([1, 2])) == "frozenset({1, 2})"
 
 
 class TestFormatBase: