python virtual environment
python3 -m venv env
python -m virtualenv env #py2
source env/bin/activate
#all this is on same directory
                                
                            python virtual environment
python3 -m venv env
python -m virtualenv env #py2
source env/bin/activate
#all this is on same directory
                                
                            creating virtual environment python
python3 -m venv tutorial-env
#name : tutorial-env
tutorial-env\Scripts\activate 	#activate env
deactivate #deactivate env
                                
                            how to use virtual environment python
python3 -m pip install --user virtualenv
                                
                            python virtual env
$ export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python2.7
                                
                            how to activate python virtual environment
#open directory with terminal where you crated vertual environment
#example your venv name <visualscrapy>
teamspirit:~$ cd visualscrapy
#teamspirit:~/visualscrapy$  <-- output
#Now type bellow command
source ./bin/activate
#(visualscrapy) teamspirit:~/visualscrapy$   <-- output
                                
                            python activate virtual environment
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope Process
                                
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