WIP/API: rename MultiIndex.labels to MultiIndex.codes

[topper-123]

• closes API: MultiIndex.labels -> codes #13443
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

This PR renames MultiIndex.labels to MultiIndex.codes.

This is a work in progress. Still need to do:

• go though the docs and doc strings, especially advanced.rst
• Deprecation tests
• whatsnew section

Apart from the above this should be fairly complete, so would appreciate comments on the changes though.

[pep8speaks]

Hello @topper-123! Thanks for updating the PR.

• There are no PEP8 issues in the file pandas/core/frame.py !

• There are no PEP8 issues in the file pandas/core/groupby/generic.py !

• There are no PEP8 issues in the file pandas/core/indexes/base.py !

• There are no PEP8 issues in the file pandas/core/indexes/multi.py !

• There are no PEP8 issues in the file pandas/core/panel.py !

• There are no PEP8 issues in the file pandas/core/reshape/concat.py !

• There are no PEP8 issues in the file pandas/core/reshape/merge.py !

• There are no PEP8 issues in the file pandas/core/reshape/reshape.py !

• There are no PEP8 issues in the file pandas/core/series.py !

• There are no PEP8 issues in the file pandas/core/util/hashing.py !

• There are no PEP8 issues in the file pandas/io/formats/excel.py !

• There are no PEP8 issues in the file pandas/io/pytables.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_alter_axes.py !

• There are no PEP8 issues in the file pandas/tests/groupby/test_groupby.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_astype.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_compat.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_constructor.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_copy.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_equivalence.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_get_set.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_integrity.py !

• There are no PEP8 issues in the file pandas/tests/indexes/multi/test_names.py !

• There are no PEP8 issues in the file pandas/tests/test_multilevel.py !

• There are no PEP8 issues in the file pandas/tests/test_panel.py !

• There are no PEP8 issues in the file pandas/util/testing.py !

Comment last updated on November 13, 2018 at 08:57 Hours UTC

[topper-123]

Found some issues. Closed temporarily.