Virtual environment related name command

• # Installation 
  PIP install virtualenvwrapper-win -> Windows version 
  PIP install virtualenvwrapper     -> mac

   

• # Using 
  1 to create a virtual environment and switches to this environment: mkvirtualenv name.
   2. By switching to a virtual environment: pip install requests -> installation module
   3 unloading module virtual environment:. Uninstall PIP Requests
   4. Check ambient All installed packages: pip list: all / pip freeze: no initial packages installed afterwards /   pip freeze- > all: all
   5. Activate the virtual environment: workon name
   6. See how many virtual environments: lsvirtualenv
   7. Delete the virtual environment: rmvirtualenv name
   8. Exit the virtual environment: deactivate

   

• # On-line deployment: the completion of the project, with a lot of modules, frameworks, libraries rely on more than 300 --- -> need to ensure consistent production environment and development environment, 
  deployment -> is not running on the server, you need to Support for modules, frameworks, and dependencies
   # 1. Activate the virtual environment 
  workon name
   in the development environment # 2. Generate a dependency list in the virtual environment: requirements.txt, the command is not mandatory, but it is customary. 
  pip freeze> requirements.txt
   # 3. In a production environment or another development environment, batch installation depends on 
  pip instll- r requirements.txt
   # 4. Batch uninstall 
  pip uninstall -r requirements.txt -y --yes