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Union of indexes of tuples is not sorted #17376
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Looks to work on master. Could use a test.
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good first issue
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Unit test(s) needed to prevent regressions
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I believe this test already exists: https://github.com/pandas-dev/pandas/blob/master/pandas/tests/indexes/test_base.py#L1866
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Thanks @dwhu. Yes looks like this case is covered. |
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Code Sample, a copy-pastable example if possible
Result:
Index([(1, b'A'), (2, b'A'), (1, b'B'), (2, b'B'), (1, b'C'), (2, b'C')], dtype='object')
This was already known (the example above is copied from the tests), but I don't see it reported anywhere.
Problem description
The
Index.union
docs states the result is sorted if possible - and it is possible with the above.Expected Output
Output of
pd.show_versions()
INSTALLED VERSIONS
commit: 0d676a3
python: 3.5.3.final.0
python-bits: 64
OS: Linux
OS-release: 4.9.0-3-amd64
machine: x86_64
processor:
byteorder: little
LC_ALL: None
LANG: it_IT.UTF-8
LOCALE: it_IT.UTF-8
pandas: 0.21.0.dev+405.g0d676a3cc
pytest: 3.0.6
pip: 9.0.1
setuptools: None
Cython: 0.25.2
numpy: 1.12.1
scipy: 0.19.0
pyarrow: None
xarray: None
IPython: 5.1.0.dev
sphinx: 1.5.6
patsy: 0.4.1
dateutil: 2.6.0
pytz: 2017.2
blosc: None
bottleneck: 1.2.1
tables: 3.3.0
numexpr: 2.6.1
feather: 0.3.1
matplotlib: 2.0.2
openpyxl: None
xlrd: 1.0.0
xlwt: 1.1.2
xlsxwriter: 0.9.6
lxml: None
bs4: 4.5.3
html5lib: 0.999999999
sqlalchemy: 1.0.15
pymysql: None
psycopg2: None
jinja2: 2.9.6
s3fs: None
fastparquet: None
pandas_gbq: None
pandas_datareader: 0.2.1
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