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BUG: interpolate gives a TypeError on empty dataframes #35598

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Closed
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sanderland opened this issue Aug 7, 2020 · 1 comment · Fixed by #35543
Closed
3 tasks done

BUG: interpolate gives a TypeError on empty dataframes #35598

sanderland opened this issue Aug 7, 2020 · 1 comment · Fixed by #35543
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Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Bug Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Regression Functionality that used to work in a prior pandas version
Milestone
1.1.1

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@sanderland
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sanderland commented Aug 7, 2020 •
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Already fixed in #35543, making an issue for linking/discussion.

  • I have checked that this issue has not already been reported.

  • I have confirmed this bug exists on the latest version of pandas.

  • (optional) I have confirmed this bug exists on the master branch of pandas.

Note: Please read this guide detailing how to provide the necessary information for us to reproduce your bug.

Code Sample, a copy-pastable example

from pandas import DataFrame
DataFrame().interpolate()
"Cannot interpolate with all object-dtype columns "

TypeError: Cannot interpolate with all object-dtype columns in the DataFrame. Try setting at least one column to a numeric dtype.

Problem description

This is a regression, 1.0.5 handles it fine.

The problem appeared due to checking np.all(obj.dtypes == np.dtype(object)) since the all of an empty set is True

Expected Output

Output of pd.show_versions()

pandas : 1.1.0
@sanderland sanderland added Bug Needs Triage Issue that has not been reviewed by a pandas team member labels Aug 7, 2020
@sanderland sanderland mentioned this issue Aug 7, 2020
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@simonjayhawkins simonjayhawkins added Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate and removed Needs Triage Issue that has not been reviewed by a pandas team member labels Aug 7, 2020
@simonjayhawkins simonjayhawkins added this to the 1.1.1 milestone Aug 7, 2020
@simonjayhawkins simonjayhawkins added the Regression Functionality that used to work in a prior pandas version label Aug 7, 2020
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change in behaviour caused by #33084 cc @jbrockmendel

e894809 is the first bad commit
commit e894809
Author: jbrockmendel [email protected]
Date: Sun Mar 29 08:16:17 2020 -0700

CLN: de-kludge NDFrame.interpolate (#33084)

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Algos Non-arithmetic algos: value_counts, factorize, sorting, isin, clip, shift, diff Bug Missing-data np.nan, pd.NaT, pd.NA, dropna, isnull, interpolate Regression Functionality that used to work in a prior pandas version
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REGR: Fix interpolation on empty dataframe sanderland/pandas
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@simonjayhawkins @sanderland