ix setting with enlargement results in stale caches. · Issue #4939 · pandas-dev/pandas (original) (raw)

Skip to content

Navigation Menu

• • GitHub Copilot Write better code with AI
  • GitHub Models New Manage and compare prompts
  • 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

Appearance settings

Description

When doing setting with enlargement like:

import pandas as pd panel = pd.util.testing.makePanel() pd.ix[0] # get first item into cache panel.ix[:, :, 'A+1'] = panel.ix[:, :, 'A'] + 1 assert "A+1" in panel.ix[0].columns # fails due to stale item cache assert "A+1" in panel.ix[1].columns # succeeds

The same thing happens with DataFrames.

df = pd.util.testing.makeDataFrame() df['A'] # cache series df.ix["Hello Friend"] = df.ix[0] assert "Hello Friend" in df['A'].index # fails assert "Hello Friend" in df['B'].index # success