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BUG: keys argument in pandas.concat does not preserve Index name #14252

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wesm opened this Issue Sep 19, 2016 · 0 comments

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Bug Difficulty Intermediate Effort Low Indexing Reshaping
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@wesm @jreback
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wesm commented Sep 19, 2016

Code Sample, a copy-pastable example if possible

df = pd.DataFrame({'foo': [1, 2, 3, 4],
                   'bar': [0.1, 0.2, 0.3, 0.4]})
index = pd.Index(['a', 'b'], name='baz')

concatted = pd.concat([df, df], keys=index)
concatted.index.names

## -- End pasted text --
Out[3]: FrozenList([None, None])

Expected Output

FrozenList(['baz', None])

output of pd.show_versions()

A few days older than master:

commit: 5e2f9da6e8e713bd89cfe8760e63583ea7d29879

@jreback jreback added Bug Indexing Difficulty Intermediate Effort Low labels Sep 19, 2016

jreback added this to the Next Major Release milestone Sep 19, 2016

jreback added the Reshaping label Sep 19, 2016

This was referenced Sep 20, 2016

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@jreback jreback modified the milestone: 0.19.1, Next Major Release Oct 8, 2016

jreback closed this in 16b64f1 Oct 9, 2016

@tworec tworec added a commit to RTBHOUSE/pandas that referenced this issue Oct 21, 2016

@tworec Ben Kandel + tworec BUG: Fix concat key name 
closes #14252
Fixes a bug where `pd.concat` didn't propagate the names of keys used to
create  a hierarchical index.

Author: Ben Kandel <ben.kandel@gmail.com>

Closes #14292 from bkandel/fix_concat_key_name and squashes the following commits:

cdc76f6 [Ben Kandel] take out _ensure_index
4a301f8 [Ben Kandel] put back in Index coercion
d8e2c17 [Ben Kandel] remove coercion to Index before _ensure_index
44932cc [Ben Kandel] changed whatsnew entry to 0.19.1
c51df19 [Ben Kandel] _ensure_index
b54b081 [Ben Kandel] simplified logic
3256119 [Ben Kandel] typo
789ecd4 [Ben Kandel] use _ensure_index
350e724 [Ben Kandel] simplified logic
9615a69 [Ben Kandel] extra tests
5c0108b [Ben Kandel] comments
dd3c4cc [Ben Kandel] comments
5cd8392 [Ben Kandel] added test for names
bc5f1fb [Ben Kandel] cleanup
ef6db68 [Ben Kandel] BUG: Propagate key names in concat.
 8720013

Dr-Irv referenced this issue Jan 12, 2017

Closed

BUG: Fix for GH #14848 for groupby().describe() with tuples as the Index #15110

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