Installing python3 in a python2 virtual environment

Solution 1:

It's not recommended to mix multiple versions of Python. In fact, I don't think it's even possible.

Creating a new virtualenv isn't difficult at all:

Get the list of modules in the current virtualenv

source /path/to/current/bin/activate
pip freeze > /tmp/requirements.txt

Create a new virtualenv. Either change into a suitable directory before executing the virtualenv command or give a full path.
```
deactivate
virtualenv -p python3 envname
```

Install modules

source envname/bin/activate
pip install -r /tmp/requirements.txt

That's it.