Fixed namespace issue

Author: jfegg

pandas/tests/frame/methods/test_update.py

@@ -233,13 +233,13 @@ def test_update_preserve_mixed_dtypes(self):
         # GH#44104
         dtype1 = pd.Int64Dtype()
         dtype2 = pd.StringDtype()
-        df = pd.DataFrame({"a": [1, 2, 3], "b": ["x", "y", "z"]})
+        df = DataFrame({"a": [1, 2, 3], "b": ["x", "y", "z"]})
         df = df.astype({"a": dtype1, "b": dtype2})
 
-        other = pd.DataFrame({"a": [4, 5], "b": ["a", "b"]})
+        other = DataFrame({"a": [4, 5], "b": ["a", "b"]})
         other = other.astype({"a": dtype1, "b": dtype2})
 
-        expected = pd.DataFrame({"a": [4, 5, 3], "b": ["a", "b", "z"]})
+        expected = DataFrame({"a": [4, 5, 3], "b": ["a", "b", "z"]})
         expected = expected.astype({"a": dtype1, "b": dtype2})
 
         df.update(other)