correction on test for issue-pandas-dev#34529

Author: Veronur

pandas/tests/frame/test_apply.py

@@ -785,13 +785,13 @@ def non_reducing_function(val):
             df.applymap(func)
             assert values == df.a.to_list()
 
-    def test_apply_with_byte_string(self):  
-        #GH-34529
+    def test_apply_with_byte_string(self):
+        # GH 34529
         try:
             df = pd.DataFrame(np.array([b'abcd', b'efgh']), columns=['col'])
             df.apply(lambda x: x.astype('object'))
         except OSError as err:
-            tm.external_error_raised(a)
+            tm.external_error_raised(err)
 
 class TestInferOutputShape:
     # the user has supplied an opaque UDF where