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Series[sparse].to_sparse messes up length #22389

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TomAugspurger opened this issue Aug 16, 2018 · 0 comments

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commented Aug 16, 2018

In [23]: a = pd.Series(pd.SparseArray([1, 2, None, 2]))

In [24]: b = a.to_sparse()

In [25]: len(a), len(b)
Out[25]: (4, 3)

In [26]: b
Out[26]:
0    1.0
1    2.0
2    2.0
3
dtype: float64
IntIndex
Indices: array([0, 1, 2], dtype=int32)

Fixing in #22325, this is to link from the release notes.

@TomAugspurger TomAugspurger added this to the 0.24.0 milestone Aug 16, 2018

TomAugspurger added a commit to TomAugspurger/pandas that referenced this issue Aug 18, 2018

brute4s99 added a commit to brute4s99/pandas that referenced this issue Nov 19, 2018

[API/REF]: SparseArray is an ExtensionArray (pandas-dev#22325)
Makes SparseArray an ExtensionArray.

* Fixed DataFrame.__setitem__ for updating to sparse.

Closes pandas-dev#22367

* Fixed Series[sparse].to_sparse

Closes pandas-dev#22389

Closes pandas-dev#21978
Closes pandas-dev#19506
Closes pandas-dev#22835
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