Create and manage Python virtual environments (ubuntu18.04)

Different applications often use different versions of modules and packages .

In the virtual environment, we can only install the dependent packages required by the program , The virtual environments are isolated from each other , They don't influence each other .

The way 1. adopt Terminal terminal

1. python3 -m venv venv1 Create the directory where the virtual environment is located

2. source venv1/bin/activate Activate the virtual environment

3. rm -rf venv1 Delete virtual environment venv1

4. pip list View the installed libraries in the virtual environment

5. pip install xxx Install third party libraries

6. deactivate Exit virtual environment

The way 2. adopt pyenv + virtualenv Use

1. git clone https://github.com/pyenv/pyenv-virtualenv.git $(pyenv root)/plugins/pyenv-virtualenv

2. echo 'eval "$(pyenv virtualenv-init -)"' >> ~/.bashrc

3. source ~/.bashrc

Creating a virtual environment venv2

1. pyenv virtualenv 3.7.10 venv2

Activate the environment venv2

1. pyenv activate venv2

2. Start using the environment

Switch back to the system environment

1. pyenv deactivate

Delete environment venv2

1. rm -rf ~/.pyenv/versions/venv2