自定义pip包安装后Python无法识别，跨系统均遇此问题求助

Hey there, let’s work through this frustrating import issue with your PyColours package. I’ve looked at its PyPI listing, and these are the most common fixes to get things working:

1. Double-check the import name vs. PyPI package name #

PyPI package names are case-insensitive, but Python module imports are case-sensitive and often use lowercase even if the PyPI name has capital letters. For example, if your actual module folder is named pycolours (all lowercase), you’ll need to run import pycolours instead of import PyColours.

To confirm the correct import name:

• Run pip show PyColours to get the installation location (look for the Location line)
• Navigate to that directory and check the folder name of your package—this is the name you need to use for imports.

2. Validate your package structure and build config #

If your package wasn’t built correctly, the module files won’t be placed where Python can find them. Here’s what to check:

• Make sure your project has a proper structure, like:

  your-project-folder/
  ├── pycolours/          # This is the actual module folder
  │   ├── __init__.py     # Required (even empty) for older build tools
  │   └── core.py         # Your code files
  ├── setup.py            # Or pyproject.toml
  └── README.md
  

• In setup.py, ensure the packages parameter correctly points to your module folder. For example:

  from setuptools import setup, find_packages
  
  setup(
      name="PyColours",  # Matches PyPI name
      packages=find_packages(),  # Automatically finds your module folder
      # ... other configs
  )
  

• If using pyproject.toml, confirm the packages entry lists your module name (e.g., packages = ["pycolours"]).

3. Fix Python environment mismatches #

It’s easy to install the package in one environment but run Python from another. Try these steps:

• Use python -m pip install PyColours instead of just pip install—this ensures you’re installing to the Python version you’re actually running.
• Check your current Python path with python -c "import sys; print(sys.path)"—the installation location from pip show PyColours should be in this list.
• On Ubuntu, make sure you’re not confusing python (Python 2) with python3 (Python 3)—use python3 -m pip install PyColours and python3 to test imports.

4. Clear caches to eliminate stale data #

Sometimes cached files cause false positives. Try:

• Clear the pip cache: pip cache purge
• Delete any __pycache__ folders in your project or installation directory
• Uninstall and reinstall the package cleanly: pip uninstall -y PyColours && pip install PyColours

5. Test with a fresh virtual environment #

Environment pollution can cause weird import issues. Create a clean environment to test:

Ubuntu/macOS: #

python3 -m venv pycolours-test
source pycolours-test/bin/activate
pip install PyColours
python3 -c "import pycolours"  # Use the module name you found earlier

Windows: #

python -m venv pycolours-test
pycolours-test\Scripts\activate
pip install PyColours
python -c "import pycolours"

If none of these work, feel free to share your project’s folder structure or your setup.py/pyproject.toml code—we can dig deeper!

内容的提问来源于stack exchange，提问作者Aeossa