Jupyter Notebook/Lab回车换行异常、Tab跳转单元格问题求助

Let's break down how to fix those annoying keyboard glitches—since they're happening across Jupyter, Colab, and Coursera (but not PyCharm), it's likely a system-level or browser-related issue rather than a Jupyter-specific bug. Here's what to check step by step:

1. Rule Out Hardware & System Core Settings #

First, eliminate the basics:

• Test your keyboard in a plain text editor: Open Notepad (Windows) or TextEdit (Mac), type something, press Enter—does it only add one line? Press Tab—does it just indent? If this is broken, your keyboard might be faulty, or you have stuck keys.
• Check system accessibility features:
  • On Windows: Go to Settings > Accessibility > Keyboard, make sure Sticky Keys, Filter Keys, and Toggle Keys are turned off.
  • On Mac: Go to System Settings > Accessibility > Keyboard, disable any options that modify key behavior (like Sticky Keys or Slow Keys).
• Quit third-party keyboard tools: If you use apps like AutoHotkey, Karabiner-Elements, BetterTouchTool, or any other tool that remaps keys, close them completely and restart your browser to test again. These tools often override key behavior across all apps, including web-based ones.

2. Fix Browser-Related Conflicts #

Since the issue happens in web-based environments (even Colab), your browser's extensions or settings might be the culprit:

• Disable all browser extensions: In Chrome/Firefox, go to your extensions page and disable everything. Then open Colab and test the Enter/Tab keys. If the problem goes away, re-enable extensions one by one to find the conflicting one (keyboard-enhancement or productivity extensions are common offenders).
• Reset your browser to default settings: This clears custom configurations that might be interfering. For Chrome: Settings > Advanced > Reset and clean up > Restore settings to their original defaults. For Firefox: Help > More troubleshooting information > Refresh Firefox.

3. Clean Up Jupyter's Persistent Configs #

If you're still having issues with local Jupyter, your old config files might have survived the reinstall:

• Delete Jupyter's config folder:
  • Windows: Delete %USERPROFILE%/.jupyter
  • Mac/Linux: Delete ~/.jupyter
• Restart Jupyter—this will generate fresh default configs without any custom key mappings.
• Check Jupyter Lab's keyboard shortcuts: Open Jupyter Lab, go to Settings > Advanced Settings Editor > Keyboard Shortcuts. Search for "tab" and "enter" to make sure no custom shortcuts are mapping Tab to "focus next cell" or Enter to double newlines.

4. Test with Default Input Method #

Sometimes third-party input methods (like Chinese/Japanese keyboards) can interfere with web app key handling:

• Switch to your system's default English input method (e.g., US Keyboard on Windows/Mac), then test the keys in Jupyter/Colab. If the problem disappears, check your input method's settings for any key remapping features.

内容的提问来源于stack exchange，提问作者Animeta