API: pd.concat with len(keys) != len(values) does not raise; intentional? · Issue #43485 · pandas-dev/pandas (original) (raw)

Skip to content

Navigation Menu

• • GitHub Copilot Write better code with AI
  • GitHub Advanced Security Find and fix vulnerabilities
  • Actions Automate any workflow
  • Codespaces Instant dev environments
  • Issues Plan and track work
  • Code Review Manage code changes
  • Discussions Collaborate outside of code
  • Code Search Find more, search less
• Explore
  • Learning Pathways
  • Events & Webinars
  • Ebooks & Whitepapers
  • Customer Stories
  • Partners
  • Executive Insights
• • GitHub Sponsors Fund open source developers
  • The ReadME Project GitHub community articles
• • Enterprise platform AI-powered developer platform
• Pricing

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Sign up

Description

import pandas as pd ser = pd.Series(range(5)) sers = [ser + n for n in range(4)] keys = ["A", "B", "C"]

pd.concat(sers, keys=keys, axis=1) A B C 0 0 1 2 1 1 2 3 2 2 3 4 3 3 4 5 4 4 5 6

I expected the pd.concat below to raise. It kind of makes sense as a reindex or analogue to the DataFrame constructor, but seems more likely to me to be a footgun. In particular, I think the lack of raising may be hiding a bug in the groupby code.

Is not-raising an intentional decision? If so, thoughts on either deprecating or issuing a warning?