pip 安装未安装到 virtualenv

Question

I'm very new to all of this, so bear with me.

I started, and activated, a virtual environment. But when I pip install anything, it installs to the computer, not the the virtual env.

I'm on a Mac, trying to build a Django website.

Example: With the virtual machine activated. I type:

python -m pip install Django

Then I can deactivate the virtual env, and type:

pip freeze

And it will list out the freshly installed version of Django.

Any clue as to why this is happening?

Answer 1

Run this line from your project folder where "env" is your virtual enviroment

# A virtualenv's python:
$ env/bin/python -m pip install django

Answer 2

If you want to install to your virtualenvironment you have to activate it, otherwise it will install to the main folder.

Answer 3

Confirm you're in the virtual environment by checking the location of your Python interpreter, it should point to the env directory.

On macOS and Linux:

which python
.../env/bin/python

As long as your virtual environment is activated pip will install packages into that specific environment and you'll be able to import and use packages in your Python application.