Eclipse PyDev多Python版本配置及运行模式恢复求助

Hey there, let's work through your PyDev issues one by one— I’ve dealt with similar version mismatches and run configuration headaches before, so here’s what’s worked for me:

1. Assign Specific Python Versions to Different Projects #

This is the key to avoiding cross-version syntax errors, and PyDev makes it straightforward to set per-project interpreters:

• Right-click your target project → Select Properties
• In the left sidebar, navigate to PyDev - Interpreter/Grammar
• Check the box for Use custom interpreter, then pick the Python version you need (2.7 or 3.5.1) from the dropdown list
• Don’t forget to set the Grammar version to match (e.g., 2.7 for Python 2.7, 3.5 for Python 3.5) — this ensures syntax checking aligns with the version you’re using
• Click Apply and Close — from now on, this project will use your chosen interpreter every time you run it

2. Permanently Delete Invalid Interpreters in PyDev #

Getting rid of stale or unused interpreters keeps your setup clean and avoids confusion:

• Open Eclipse’s Window menu → Select Preferences
• Expand the left menu: PyDev → Interpreters → Python Interpreter
• In the right pane’s interpreter list, select the invalid one you want to remove (e.g., old paths, unused versions)
• Click the red Remove button (the X icon at the top of the list) and confirm the deletion
• If there are leftover invalid library paths associated with the interpreter, switch to the Libraries tab, select the stale paths, and click Remove there too
• Note: If the interpreter is still linked to any project, PyDev will warn you — switch those projects to a valid interpreter first before deleting

3. Restore Standard Run Mode (Instead of Python Unit Tests) #

The "Ran 0 tests" message means your project is set to run as a test suite instead of a regular script. Fix this with either of these methods:

Option 1: Adjust Existing Run Configuration #

• Click the Run menu → Select Run Configurations...
• In the left list, find Python Run (not Python unit-test). If you already have a config for your project, select it; if not, click the New launch configuration button (the + icon)
• In the Main tab, confirm the correct project and main module (your entry script, like main.py) are selected
• Switch to the Interpreter tab to ensure it matches the project’s assigned Python version
• Click Run — this will set the project to run in standard mode going forward

Option 2: Reset Default Right-Click Run Behavior #

• Right-click your project → Run As → Run Configurations...
• Delete any existing Python unit-test configurations for the project (select them and click the red X)
• Go back to your project, right-click → Run As → Python Run
• Now, when you right-click and run the project, it’ll default to standard mode instead of unit tests
• Bonus check: If your project was mistakenly marked as a test project, go to Properties → PyDev - Test and disable any unintended test configurations

内容的提问来源于stack exchange，提问作者George Tomlinson