Setting up a virtual environment for a project
Python's virtual environment can be similar to the Tomcat container in Java.
Its main purpose is to create mutually independent runtime environments for different projects. In the virtual environment, each project has its own package, independent of other projects. In a virtual environment, each project has its own package, independent of other projects. ** Different virtual environments can have different versions of the same package. **There is no limit to the number of virtual environments.
After creating a Python project, a virtual environment named venv will be created by default. Of course, we can also create our own virtual environment with the following command:
Creating a Virtual Environment Method 1
The following command sets up a virtual environment named test_venv for the project python_demo_1.
python3 -m venv test_venv
Creating a Virtual Environment Method 2
To create a virtual environment via the virtualenv command, first install the virtual environment tool via the pip command
pip install virtualenv
Then, we create a virtual environment named "evn_demo"
virtualenv evn_demo
Activate the virtual environment
To activate a virtual environment on Windows, just go to the Scripts directory of the virtual environment you want to activate and run command. Similarly: to exit a virtual environment, you only need to execute thecommand. As shown in the following figure:
The command to activate the virtual environment under Linux is:
source env_demo/bin/activate
Exiting the virtual environment
deactivate
Creating a virtual environment without commands
The way to do this is byFile---->Settings—>Project:python_deom_1(Project Name)—>Project Interpreter---->Add Local
Search third-party libraries
A Python project always depends on a lot of third-party libraries, for example, now we're going to introduce thewebsocketlibrary, but don't know the version, what should we do? Again, we can search on pycharm as follows:
File---->Settings->Project:python_deom_1 (project name)->Project Interpreter Click on the **+** sign in the list of all third-party libraries.
In the following picture, we are searching for the websocket package, and the latest version we found is 0.2.1. Then, click the Install Package button to install the package. Of course, we can also check the Specify version to select another version.
Click the Manage Repositories button to change the mirror source of pip. Here you can change the official repositories to Tsinghua repositories.
/simple
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