git - Best practice to deploy python app to use a specific version of Python with venv -

i done project , has been been pushed git client wants venv. got venv work , created requirements.txt file.

my question best practice deployment workflow. far created deploy workflow:

git clone ssh://myawesomerepo cd myawesomerepo pip install virtualenv venv -python=python3.5 env source env/bin/activate pip install -r requirements.txt python run.py 

is correct workflow?

assuming don't know version of python client has. project written python 3.5, , if client has 2.7 work?*

i tend use anaconda package manager rather venv, 1 of nice features if run

conda create -n myenv python=3.5 

it download , install python 3.5 if it's not installed on system already.