Python3无法导入Peewee模块求助：Python2可导入但Python3提示模块未找到

Hey there! Let's sort out why you're hitting that "module not found" error for Peewee in Python 3, even though it works fine in Python 2. This is a super common pitfall with Python's environment separation—here's how to fix it step by step:

Python 2 and Python 3 maintain separate package libraries by default, so it’s likely you only installed Peewee for Python 2. To fix this:

• Use Python 3’s dedicated package installer: run pip3 install peewee in your terminal.
• If you have multiple Python 3 versions (like 3.8, 3.9, etc.), target the exact version with python3.x -m pip install peewee (replace x with your minor version number). This ensures the package gets installed to the Python 3 instance you’re actually using.

Sometimes the issue is that you’re running a different Python version than you think:

• Verify which Python you’re invoking: run python --version—if it shows 2.x, you need to use python3 instead to run your script (e.g., python3 your_script.py).
• If you use virtual environments, make sure you’ve activated the correct Python 3 virtual environment first. Once activated, just run pip install peewee and it will install the package directly into that isolated environment.

On many systems, python defaults to Python 2, while python3 points to Python 3. Similarly, pip maps to Python 2’s installer, and pip3 maps to Python 3’s:

• Always use python3 and pip3 when working with Python 3 projects to avoid mixing up environments.
• You can confirm which Python version your pip is tied to by running pip3 --version—it should show a Python 3 path.

If you suspect there’s a broken installation or conflicting packages, do a clean reinstall:

• First uninstall Peewee from Python 3: pip3 uninstall peewee
• Then reinstall it: pip3 install peewee

If you’re getting permission errors when installing, avoid using sudo unless absolutely necessary (it can mess up system-level packages). Instead, use a virtual environment, or install the package for your user only with pip3 install --user peewee.

内容的提问来源于stack exchange，提问作者Kaan Aslan