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DEPR: read_csv header with non-exisiting rows behaving differently #47400

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Closed
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phofl opened this issue Jun 17, 2022 · 0 comments · Fixed by #47493
Closed
3 tasks done

DEPR: read_csv header with non-exisiting rows behaving differently #47400

phofl opened this issue Jun 17, 2022 · 0 comments · Fixed by #47493
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Deprecate Functionality to remove in pandas IO CSV read_csv, to_csv Needs Triage Issue that has not been reviewed by a pandas team member

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phofl commented Jun 17, 2022

Pandas version checks

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

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

  • I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

data = """a,b
1,2"""

pd.read_csv(StringIO(data), header=[0, 1, 2], engine="python")

This creates a MultiIndex with 2 levels

While the c engine raises


pandas.errors.ParserError: Passed header=[0,1,2], len of 3, but only 2 lines in file

Issue Description

They should be consistent, since the c engine is more widely used, I would propose adapting the behavior to raise for the python engine. We've deprecated this behavior for usecols and will raise starting with 2.0. We should do something similar here.

Expected Behavior

Both engines should be consistent

Installed Versions

Replace this line with the output of pd.show_versions()

@phofl phofl added IO CSV read_csv, to_csv Deprecate Functionality to remove in pandas Needs Triage Issue that has not been reviewed by a pandas team member labels Jun 17, 2022
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Labels
Deprecate Functionality to remove in pandas IO CSV read_csv, to_csv Needs Triage Issue that has not been reviewed by a pandas team member
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