Can't .loc[label] on a CategoricalIndex with labels being integer · Issue #17569 · 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

I came around this and this seemed related to #9595 but could also be a bug in the above interacting with the CategoricalIndex. Using the same example as #15470 with pandas 0.20.3:

Code Sample

s = pd.Series([2, 1, 0], index=pd.CategoricalIndex([2, 1, 0]))
s[2]  # works (interpreting as label)
s.loc[2]  # fails with TypeError: cannot do label indexing on <class 'pandas.core.indexes.category.CategoricalIndex'> with these indexers [2] of <class 'int'>

# of course the below works!
s = pd.Series([2, 1, 0], index=[2, 1, 0])
s[2]  # works (interpreting as label)
s.loc[2]  # works (interpreting as label)

Problem description

s.loc[2] shouldn't fail and should select the label '2'.
Note this happens also with a pd.DataFrame.