如何在保留全局版本的同时将特定包继承到Python虚拟环境中？

Inheritance of Specific Packages in Virtual Environments

Virtual environments provide a way to isolate Python dependencies for specific projects. However, you may sometimes need to incorporate libraries from the global Python installation into your virtualenv without installing them through package managers.

To achieve this selective inheritance, follow the steps below:

1. Create the virtualenv with system packages:

<code class="bash">virtualenv --system-site-packages</code>

2. Activate the virtualenv:

<code class="bash">source bin/activate</code>

3. Install specific libraries:

Use pip with the --ignore-installed or -I flag to install libraries in the virtualenv while ignoring system-installed versions:

<code class="bash">pip install --ignore-installed matplotlib</code>

By using this method, the packages installed in the virtualenv will override the global versions, allowing you to import and use them within your virtual environment.

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