Answers for "what is virtual python environment"

python virtual environment

python3 -m venv env
python -m virtualenv env #py2

source env/bin/activate

#all this is on same directory

python virtual enviroment

# create new environment named my_env
python3 -m venv my_env

# activate
source my_env/bin/activate

# deactivate
deactivate

python virtual env

$ source venv/bin/activate