A virtual environment, or venv, is a tool used to isolate specific Python environments on a single machine. It allows you to create separate environments for different projects, each with its own set of packages and dependencies. This can be useful for a number of reasons, including:
- Avoiding conflicts between packages: By using different virtual environments for different projects, you can avoid installing packages that have conflicting dependencies or version requirements.
- Testing and development: Virtual environments allow you to experiment with different package versions and configurations without affecting your global Python installation or other projects.
- Reproducibility: Virtual environments make it easier to reproduce the exact package versions and dependencies used in a specific project, which can be important for collaboration and deployment.
To create a virtual environment in Python, you can use the
venv module that is included in the Python standard library. Here is an example of how to create and activate a virtual environment:
$ python3 -m venv myenv $ source myenv/bin/activate (myenv) $
The first command creates a new virtual environment called
myenv in the current directory. The second command activates the environment. When the environment is activated, the virtual environment's name is displayed in parentheses at the beginning of the command prompt, to indicate that you are working in the virtual environment.
To install packages in the virtual environment, you can use the
pip package manager. For example:
(myenv) $ pip install requests
This installs the
requests package in the
myenv virtual environment. The package will be available only in this environment, and will not be installed globally or affect other environments.
To deactivate the virtual environment, you can use the
(myenv) $ deactivate $
This exits the virtual environment and returns you to the global Python environment.
I hope this helps! Let me know if you have any questions or need further assistance.