Closed
Description
Code Sample, a copy-pastable example if possible
>>> c1 = pd.CategoricalIndex(['a', 'b'])
>>> c2 = pd.CategoricalIndex(['c', 'd'])
>>> s1 = pd.Series([1,2], index=c1)
>>> s2 = pd.Series([1,2], index=c2)
>>> pd.testing.assert_series_equal(s1, s2)
AssertionError: Series.index are different
Attribute "dtype" are different
[left]: category
[right]: categoryNote [left] and [right] output the same, so this help message isn't helpful.
Problem description
You can't see from the description where the differences in the CategoricalIndexes are. The reason is that Categorical return "category" for str(c1) and to see details, you need repr(c1).
Expected Output
The solution could be in the function util.testing.py::raise_assert_detail to replace
msg = """{obj} are different
{message}
[left]: {left}
[right]: {right}""".format(obj=obj, message=message, left=left, right=right)
with the repr-formattes strings:
msg = """{obj} are different
{message}
[left]: {left!r}
[right]: {right!r}""".format(obj=obj, message=message, left=left, right=right)
Note the (!r). This will give the full repr output which you'll almost always want anyway.
Alternatively, the decision to let str(c1) output "category" could be changed. That would be a breaking change, though, and would require proper deprecation warning.
I could submit a PR if the solution with !r format option is acceptable.