Added issue number to test and changed comment in equals() function

Author: Mateusz Górski

pandas/core/internals/managers.py

@@ -1394,8 +1394,8 @@ def equals(self, other):
         if len(self.blocks) != len(other.blocks):
             return False
 
-        # canonicalize block order, using a tuple combining the type
-        # name and then mgr_locs because there might be unconsolidated
+        # canonicalize block order, using a tuple combining the mgr_locs
+        # then type name because there might be unconsolidated
         # blocks (say, Categorical) which can only be distinguished by
         # the iteration order
         def canonicalize(block):

pandas/tests/internals/test_internals.py

@@ -1300,6 +1300,7 @@ def test_make_block_no_pandas_array():
 
 
 def test_dataframe_not_equal():
+    # see GH28839
     df1 = pd.DataFrame({"a": [1, 2], "b": ["s", "d"]})
     df2 = pd.DataFrame({"a": ["s", "d"], "b": [1, 2]})
     assert df1.equals(df2) is False