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Merged
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Aug 28, 2021
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Added example for Dataframe.align #43225

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5b48988
added example for Dataframe.align
oovk Aug 26, 2021
7064702
Merge branch 'master' of https://github.com/oovk/pandas into adding-e…
oovk Aug 28, 2021
0f1dd58
added example for axis=0 param
oovk Aug 28, 2021
8fe967c
changes in align example
oovk Aug 28, 2021
2c559e8
passed linting checks
oovk Aug 28, 2021
2f0a55b
made requested changes
oovk Aug 28, 2021
88ae442
fixup
MarcoGorelli Aug 28, 2021
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65 changes: 65 additions & 0 deletions pandas/core/generic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8508,6 +8508,71 @@ def align(
-------
(left, right) : ({klass}, type of other)
Aligned objects.

Examples
--------
>>> df = pd.DataFrame(
... [[1, 2, 3, 4], [6, 7, 8, 9]], columns=["D", "B", "E", "A"], index=[1, 2]
... )
>>> other = pd.DataFrame(
... [[10, 20, 30, 40], [60, 70, 80, 90], [600, 700, 800, 900]],
... columns=["A", "B", "C", "D"],
... index=[2, 3, 4],
... )
>>> df
D B E A
1 1 2 3 4
2 6 7 8 9
>>> other
A B C D
2 10 20 30 40
3 60 70 80 90
4 600 700 800 900

Align on columns:

>>> left, right = df.align(other, join="outer", axis=1)
>>> left
A B C D E
1 4 2 NaN 1 3
2 9 7 NaN 6 8
>>> right
A B C D E
2 10 20 30 40 NaN
3 60 70 80 90 NaN
4 600 700 800 900 NaN

We can also align on the index:

>>> left, right = df.align(other, join="outer", axis=0)
>>> left
D B E A
1 1.0 2.0 3.0 4.0
2 6.0 7.0 8.0 9.0
3 NaN NaN NaN NaN
4 NaN NaN NaN NaN
>>> right
A B C D
1 NaN NaN NaN NaN
2 10.0 20.0 30.0 40.0
3 60.0 70.0 80.0 90.0
4 600.0 700.0 800.0 900.0

Finally, the default `axis=None` will align on both index and columns:

>>> left, right = df.align(other, join="outer", axis=None)
>>> left
A B C D E
1 4.0 2.0 NaN 1.0 3.0
2 9.0 7.0 NaN 6.0 8.0
3 NaN NaN NaN NaN NaN
4 NaN NaN NaN NaN NaN
>>> right
A B C D E
1 NaN NaN NaN NaN NaN
2 10.0 20.0 30.0 40.0 NaN
3 60.0 70.0 80.0 90.0 NaN
4 600.0 700.0 800.0 900.0 NaN
"""

method = missing.clean_fill_method(method)
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