Detailed tutorial on installing Python 3 virtual environment in Ubuntu 20.04

The following are all performed on my virtual machine

1. Install pip3

sudo apt install python3-pip

2. Install the virtual environment

sudo apt install virtualenv
sudo apt install virtualenvwrapper

3. Modify the configuration file to set environment variables

cd ~
vim .bashrc

Add the following two lines to the end of the .bashrc file

export WORKON_HOME=$HOME/.virtualenvs 
source /usr/share/virtualenvwrapper/virtualenvwrapper.sh

The sentence "usr/share/virtualenvwrapper/virtualenvwrapper.sh" is different from other Ubuntu versions. For example, on Ubuntu 18.04, it is "source /usr/local/bin/virtualenvwrapper.sh". You can find the specific file location yourself and fill it in
Tip: If you cannot find virtualenvwrapper.sh, you can use the following command to find the path where the file is located and replace the found path.

sudo find / -name virtualenvwrapper.sh

4. Enable the configuration file

source .bashrc

At this point, you can create a virtual environment normally.

PS: Let's take a look at Python3 to create a virtual environment

Purpose

Use virtual environments to isolate Python libraries between different projects

Creating a Virtual Environment

Python3 has a built-in venv module. First, create a project directory, enter the directory, and execute

python3 -m venv venv

Activate the virtual environment

Before starting work, activate the corresponding virtual environment:

.venv/bin/activate

On Windows:

venv\Scripts\activate

Once activated, your terminal prompt will display the name of the virtual environment.

Install the corresponding modules, such as:

pip install Flask

Summarize

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