Prerequisite: python3.4 + has been installed and is operational environment
A: Manual build:
Ready for a working directory
Administrators run cmd, enter the directory prepared inside
Execute the command: python -m venv virtual environment name
Activate the virtual environment (executed outside venvname): venvname \ scripts \ activate
Run python, this is the time to run the virtual environment python
Exit Virtual Environment (executed outside venvname): venvname \ scripts \ deactivate
Two: pycharm automatically build
When creating a new project, choose to create a virtual environment
After create a new environment is completely isolated from other environments, there is no third-party libraries
