Python3.4环境安装PyQt5遇SIP适配问题，及XP兼容方案咨询

1. Getting PyQt5 to work with Python 3.4 #

You're right that modern PyQt5 and SIP versions have dropped support for Python 3.4, which is why you're hitting that "SIP >=4.19.1" error. But there's a way to use older, compatible releases:

• First, install a SIP version that still supports Python 3.4. SIP 4.17 is the last release that works with 3.4. Run this command in your Python 3.4 environment:
  pip3 install sip==4.17
• Next, install a matching PyQt5 version. PyQt5 5.8.2 is the latest release that pairs with SIP 4.17 and supports Python 3.4. Install it with:
  pip3 install PyQt5==5.8.2
  Keep in mind these older versions won't have all the latest PyQt5 features, but they'll work for most basic to intermediate GUI apps on Python 3.4.

2. Running a Python 3.6 app (packaged with PyInstaller) on Windows XP #

This is totally possible, but you need to stick to specific versions and settings to ensure compatibility:

• Use Python 3.6.8: Python 3.6 is the final official release that supports Windows XP, and 3.6.8 is the last update in that branch (it includes critical fixes for XP compatibility).
• Use PyInstaller 3.6: Newer PyInstaller versions (4.0 and above) dropped XP support, so you'll need to install the last compatible version:
  pip install pyinstaller==3.6
• Package with the right flags: When building your executable, add the --win-private-assemblies flag to ensure all required DLLs are bundled with your app (instead of relying on XP's outdated system libraries). A typical command would look like:
  pyinstaller --onefile --win-private-assemblies your_script.py
• Avoid XP-incompatible code: Make sure your app doesn't use Windows APIs or libraries that weren't available in XP (like certain modern UI controls or system calls). It's always best to test the packaged executable directly on an XP machine if you can.

内容的提问来源于stack exchange，提问作者Hrvoje T