当我也有Python2.7（OS X）时，virtualenv仅创建/lib/Python2.6

Question

I installed virtualenv on my new MacBook Pro (first time Mac user) before I did anything else (probably a bad idea). When I create an env it contains /lib/Python2.6 inside of it. Afterward I installed Python2.7, but it still only includes a Python2.6 folder in lib , so I assume something is messed up.

Note: If I go to terminal and type python , I correctly get Python2.7.

I've tried to reinstall virtualenv via:

pip install virtualenv --upgrade

and, also

easy_install virtualenv

Both had the same result. They worked fine with no problems, but I still get no Python2.7 folder in lib on new envs (note: I closed and reopened the terminal each time I upgraded to be safe)...

On a side note, I also tried:

brew install virtualenv

but got the following error:

Error: No available formula for virtualenv

Answer 1

virtualenv foo_env --python=Python2.7

当您传递python参数时，它将设置该版本的bin和lib （当然，假设您安装了该版本）。

Answer 2

This does not answer your question, but I have found the easiest way to get multiple versions of Python up and running on OS X is to use macports . For major tools like PIP and VirtualEnv, macports tends to have the latest versions and it manages everything fairly well.

Then you can install a PIP specific to each version installed, as well as virtualenv. For more general cases where you don't need virtualenv, but just need to test against different vesions, you can use python_select from macports as well.

Once you have macports can install them with

sudo port install python26 py26-pip py26-virtualenv python_select

EDIT: It seems I'm getting downvoted for this response for advocating the use of MacPorts over Homebrew. The reasoning behind this answer was that I was told specifically not to depend on the version of OS X's python. This is why I have a redundant Macports Python 2.6 install and then all of the tools to complement it. If you feel this answer is poor, please leave a specific comment as to why, and how to improve it.