Hey there, let's tackle this PyQt4 installation headache you're having! First off, let's get the core issue out in the open: PyQt4 has been officially discontinued for years—it doesn't support modern Python versions (like 3.8+) and most mainstream package repositories have dropped it entirely. That's almost certainly why your pip and PyCharm attempts are hitting walls. Here's how to fix this, depending on your needs:

Option 1: Migrate to PyQt5 or PyQt6 (Highly Recommended) #

This is the best long-term solution by far. PyQt5/6 are actively maintained, work with all recent Python versions, and have an API structure nearly identical to PyQt4 (so your existing code won't need a full rewrite). To install them:

• Using pip:

  pip install pyqt5  # or pyqt6 if you want the latest version
  

• In PyCharm: Head to File > Settings > Project: [Your Project Name] > Python Interpreter, click the "+" button, search for pyqt5 or pyqt6, and install it directly from the repository list.

Option 2: Force Install PyQt4 (Only If You Must Use It) #

If you absolutely need PyQt4 for legacy code or specific dependencies, you'll need to work around its outdated support:

1. Downgrade your Python version to 3.7 or earlier—this is the last Python version that PyQt4 supports natively.
2. Install via pip using binary-only mode (this avoids compiling from source, which is usually where those ugly error messages come from):

   pip install pyqt4 --only-binary :all:
   

3. If pip still fails, try using Conda (it still hosts pre-built PyQt4 packages for older Python versions):

   conda install pyqt=4
   

4. For PyCharm integration: After installing PyQt4 via pip/Conda, go to your project's interpreter settings, select the Python 3.7 (or earlier) interpreter that has PyQt4 installed, and PyCharm will automatically recognize the package.

From your error screenshot (which shows a compilation failure), the root cause is almost definitely that your current Python version is too new for PyQt4's outdated source code. Downgrading Python or switching to PyQt5/6 will resolve this issue.

内容的提问来源于stack exchange，提问作者Mohamed Al-Helail