Python Shell中导入pyjnius报KeyError问题求助

Hey there, let's work through this pyjnius issue step by step. I've dealt with similar environment mismatches and module quirks in Python 2.7 before, so here's a structured approach to fix things:

Since your script runs fine but the interactive shell throws a KeyError, the most likely culprit is a mismatched Python environment:

• In both your working script and the problematic Python Shell, run these lines and compare the outputs:

  import sys
  print(sys.executable)  # Shows which Python interpreter is being used
  print(sys.path)        # Shows where modules are loaded from
  

  If the paths differ, you're probably using two separate Python installations—pyjnius is installed for one, but the shell is using the other.
• Quick test: In the shell, manually add the correct site-packages path from your working script, then try importing pyjnius again:

  import sys
  sys.path.append("/path/to/the/correct/site-packages")  # Replace with your path
  from jnius import autoclass
  

KeyErrors usually mean a missing attribute or dictionary key. Here's how to dig deeper:

• If you have the full error stack trace, share it! But if not, start with basic inspection in the shell:

  import jnius
  print(dir(jnius))  # Lists all available attributes in the module
  

  Compare this to what you're trying to access in your script (e.g., autoclass, JavaClass)—if the missing item isn't here, the module isn't properly loaded in the shell.
• Also, check if your script runs any JVM initialization code (like setting CLASSPATH or calling jnius.setup_jvm()) that you haven't replicated in the shell. Interactive mode doesn't run these automatically.

If pip is failing to uninstall pyjnius, try these workarounds:

• Use the full path to your Python 2.7 pip to avoid version mix-ups (e.g., if your script uses /usr/bin/python2.7, run):

  /usr/bin/pip2.7 uninstall pyjnius
  

• If pip still errors out, manually delete the module files:
  1. In your working script, run import jnius; print(jnius.__file__) to find where pyjnius is installed.
  2. Delete the entire pyjnius folder at that path, plus any related .egg-info files in the same site-packages directory.
• On Linux/macOS, add sudo before the uninstall command if you hit permission errors; on Windows, open Command Prompt as Administrator.

Once it's fully removed, reinstall with Python 2.7 compatibility in mind:

• Pyjnius dropped Python 2.7 support in newer versions, so specify an older compatible release:

  pip2.7 install pyjnius==1.2.0
  

• Ensure your Java environment is set up properly first: Verify java -version and javac -version work in your terminal, and that the JAVA_HOME environment variable points to your JDK installation.

内容的提问来源于stack exchange，提问作者King of Juice