How to recreate a virtual env in python

Question

I have installed virtualenv and virtualenvwrapper on Ubuntu 16.04 I have created one enviroment named env1

$ sudo apt-get install python-pip
$ pip install vi         


        

Answer 1

Your best option is to do this:

virtualenv-1:

pip freeze > requirements.txt 

virtualenv-2:

pip install -r requirements.txt

Assuming they are both the on the same system and use the same Python, it is somewhat possible to just copy the site-packages:

cp -Rp /environments/virtualenv-1/lib/python2.7/site-packages \
       /environments/virtualenv-2/lib/python2.7/site-packages

This won't necessarily work though:

• some packages will install dependencies and other things into /bin/ or elsewhere. most don't, but many do.
• if the python versions for the virtualenvs differ -- even on a minor version -- that can break libraries that use c extensions.

So your best bet is to pip freeze and reinstall from that file.

Answer 2

pip install virtualenvwrapper and use the cpvirtualenv command

cpvirtualenv ENVNAME [TARGETENVNAME]

http://virtualenvwrapper.readthedocs.io/en/latest/command_ref.html#cpvirtualenv

Remember to heed the warning

Copying virtual environments is not well supported. Each virtualenv has 
path information hard-coded into it, and there may be cases where the copy 
code does not know to update a particular file. Use with caution.