[Python] How to create a virtualenv by cloning the current local environment?

Suppose I have a python interpreter with many modules installed on my local system, and it has been tuned to just work.

Now I want to create a virtualenv to freeze these, so that they won't be broke by upgrading in the future.

How can I make it? Thanks.


I can't use pip freeze, because that's a cluster on which there's no pip and I don't have the privileges to install it. And I don't want the reinstall the modules either, I'm looking for that whether there's a cloning way.

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