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API: add top-level melt function as method #15521

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API: add top-level melt function as method #15521

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d54dc2f
+pd.DataFrame.melt.
ResidentMario Feb 26, 2017
3cbbed5
Melt docstring.
ResidentMario Feb 26, 2017
11f3fe4
rm stray debug.
ResidentMario Feb 27, 2017
ff895fe
Add tests, update docs.
ResidentMario Feb 27, 2017
5f306a9
+whatsnew
ResidentMario Feb 27, 2017
28a38f2
tweak whatsnew entry.
ResidentMario Mar 2, 2017
1657246
two doc changes
ResidentMario Apr 4, 2017
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tweak whatsnew entry.
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@ResidentMario
ResidentMario committed Apr 4, 2017
commit 28a38f2f83a560a6c5a77056e7cf64c1aba289d2
2 changes: 1 addition & 1 deletion doc/source/whatsnew/v0.20.0.txt
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Expand Up @@ -324,7 +324,7 @@ Other Enhancements
- ``Series.sort_index`` accepts parameters ``kind`` and ``na_position`` (:issue:`13589`, :issue:`14444`)

- ``DataFrame`` has gained a ``nunique()`` method to count the distinct values over an axis (:issue:`14336`).
- ``DataFrame`` has gained a ``melt()`` method for unpivoting from a wide to long format (:issue:`12640`).
- ``DataFrame`` has gained a ``melt()`` method, equivalent to ``pd.melt()``, for unpivoting from a wide to long format (:issue:`12640`).
- ``DataFrame.groupby()`` has gained a ``.nunique()`` method to count the distinct values for all columns within each group (:issue:`14336`, :issue:`15197`).

- ``pd.read_excel()`` now preserves sheet order when using ``sheetname=None`` (:issue:`9930`)
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