Windows系统下使用pip安装virtualenv时出现报错

Hey there, let's work through this error you're hitting when trying to install virtualenv with Python 2.7's pip. The truncated traceback points to an issue during the dependency preparation step, which is almost always tied to Python 2.7's end-of-life status and outdated tooling. Here's how to fix it:

Step 1: Upgrade pip to the last version compatible with Python 2.7 #

Python 2.7 is no longer supported, so the default pip version on your system is probably too old to handle modern package indexes or the latest (Python 3+) virtualenv releases. First, upgrade pip to the final version that works with Python 2.7:

python -m pip install --upgrade pip==20.3.4

Step 2: Install a Python 2.7-compatible version of virtualenv #

Newer virtualenv versions dropped support for Python 2.7 entirely. You'll need to install the last release that works with Python 2.7:

pip install virtualenv==20.2.2

Step 3: Troubleshoot remaining issues #

If you still run into problems, try these additional fixes:

• Clear pip's cache to resolve corrupted package downloads:

  pip cache purge
  

• If pip still fails, try using easy_install (an older package manager that sometimes handles legacy setups better):

  easy_install virtualenv==20.2.2
  

Why this works #

Python 2.7 reached its end-of-life in January 2020, meaning no new updates or security patches are released for it, and most modern packages (including newer virtualenv versions) no longer support it. By pinning both pip and virtualenv to their last compatible versions, you're ensuring compatibility with Python 2.7's runtime and package ecosystem.

内容的提问来源于stack exchange，提问作者Saurabh Singh