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Fix to_csv of DataFrame with single level multiindex. #19831

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Merged
merged 1 commit into from
Nov 1, 2018
Merged

Fix to_csv of DataFrame with single level multiindex. #19831

merged 1 commit into from
Nov 1, 2018

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EricChea
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@EricChea EricChea commented Feb 21, 2018 •
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What's this PR do?

Fixes the output of to_csv to show the value instead of the tuple when a DataFrame or Series is constructed using a MultiIndex with one level. Although, I'm not sure if it's more desirable to require a MultiIndex to be instantiated with more than one level in the future.

jreback
jreback requested changes Feb 22, 2018
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@jreback jreback added Output-Formatting __repr__ of pandas objects, to_string IO CSV read_csv, to_csv MultiIndex labels Feb 22, 2018
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codecov bot commented Feb 22, 2018 •
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Codecov Report

Merging #19831 into master will decrease coverage by <.01%.
The diff coverage is 100%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master   #19831      +/-   ##
==========================================
- Coverage   92.21%   92.21%   -0.01%     
==========================================
  Files         161      161              
  Lines       51173    51176       +3     
==========================================
+ Hits        47190    47192       +2     
- Misses       3983     3984       +1
Flag Coverage Δ
#multiple 90.64% <100%> (-0.01%) ⬇️
#single 42.23% <0%> (-0.01%) ⬇️
Impacted Files Coverage Δ
pandas/core/indexes/multi.py 95.38% <100%> (-0.08%) ⬇️
pandas/core/dtypes/base.py 100% <0%> (ø) ⬆️
pandas/core/dtypes/missing.py 93.1% <0%> (ø) ⬆️
pandas/core/dtypes/inference.py 98.38% <0%> (ø) ⬆️
pandas/core/dtypes/dtypes.py 95.61% <0%> (ø) ⬆️
pandas/core/dtypes/common.py 94.37% <0%> (ø) ⬆️
pandas/core/dtypes/cast.py 88.92% <0%> (ø) ⬆️
pandas/core/dtypes/concat.py 96.34% <0%> (ø) ⬆️

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jreback
jreback requested changes Feb 23, 2018
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@TomAugspurger
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Fixed the merge conflict, and the whatsnew note.

Ping on green.

jreback
jreback requested changes Aug 2, 2018
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can you rebase on master and will have a look

@pep8speaks
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Hello @EricChea! Thanks for updating the PR.

@gfyoung gfyoung modified the milestones: 0.25.0, 0.24.0 Oct 31, 2018
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gfyoung commented Oct 31, 2018

@jreback @TomAugspurger : Addressed all comments. Everything is green except for the fact that hypothesis is timing out on an unrelated test:

https://travis-ci.org/pandas-dev/pandas/jobs/448750638#L2895

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jreback commented Oct 31, 2018

i thought the hypothesis stuff was fixed for timeout
can we do a precursor PR to address this?

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gfyoung commented Oct 31, 2018

i thought the hypothesis stuff was fixed for timeout

I'm pretty sure it was fixed but not sure why it's complaining:

pandas/pandas/conftest.py

Line 14 in da9e358

hypothesis.settings.register_profile(

cc @Zac-HD

@gfyoung
BUG: Fix rendering of 1-level MultiIndex in to_csv
bdc20d4 
Display the level by itself instead of as a tuple
(i.e. "squash" the MultiIndex into a single level)

Closes gh-19589.
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gfyoung commented Oct 31, 2018 •
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@jreback @TomAugspurger : Everything is green now. Maybe Travis was just acting up. PTAL.

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Zac-HD commented Oct 31, 2018

Gah, it's warning about the not-yet-enforced deadline setting, which -Werror is turning into an error. This is almost certainly just due to a slow VM on Travis, but if you want I can open a PR to fix that this evening 😞

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gfyoung commented Oct 31, 2018

This is almost certainly just due to a slow VM on Travis

@Zac-HD : Indeed, that is what I suspect as well. If you could open a PR to make our tests more robust against this, that would be great!

@jreback jreback merged commit 16c0bbb into pandas-dev:master Nov 1, 2018
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jreback commented Nov 1, 2018

thanks @EricChea , @Zac-HD , and @gfyoung

@Zac-HD Zac-HD mentioned this pull request Nov 1, 2018
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tm9k1 pushed a commit to tm9k1/pandas that referenced this pull request Nov 19, 2018
@EricChea @tm9k1
BUG: Fix rendering of 1-level MultiIndex in to_csv (pandas-dev#19831)
83a77e5 
Display the level by itself instead of as a tuple
(i.e. "squash" the MultiIndex into a single level)

Closes pandas-devgh-19589.
Pingviinituutti pushed a commit to Pingviinituutti/pandas that referenced this pull request Feb 28, 2019
@EricChea @Pingviinituutti
BUG: Fix rendering of 1-level MultiIndex in to_csv (pandas-dev#19831)
71956db 
Display the level by itself instead of as a tuple
(i.e. "squash" the MultiIndex into a single level)

Closes pandas-devgh-19589.
Pingviinituutti pushed a commit to Pingviinituutti/pandas that referenced this pull request Feb 28, 2019
@EricChea @Pingviinituutti
BUG: Fix rendering of 1-level MultiIndex in to_csv (pandas-dev#19831)
f4e368f 
Display the level by itself instead of as a tuple
(i.e. "squash" the MultiIndex into a single level)

Closes pandas-devgh-19589.
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@jreback jreback jreback approved these changes

@TomAugspurger TomAugspurger TomAugspurger approved these changes

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to_csv() with a single level row MultiIndex does not produce the desired output
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@EricChea @TomAugspurger @pep8speaks @gfyoung @jreback @Zac-HD