Yes, use one per project, but know what it does. A virtual environment gives each project its own set of installed packages, which keeps dependencies separate and easy to rebuild. It is not a sandbox: code you install and run still has your user's permissions and can read your files and network.
What a virtual environment is
The Python documentation describes a virtual environment as a lightweight space with its own independent set of Python packages. By default it is isolated from the packages in the base environment, so only what you explicitly install is available. You create one with python -m venv and a folder path, and activation is optional because you can call the environment's interpreter by its full path.
The documentation also treats an environment as disposable. You should be able to delete it and recreate it from scratch, and you should not copy or move one.
What it gives you for security
| Benefit | Why it helps |
|---|---|
| Smaller package set | Fewer unknown packages to review |
| Rebuild on demand | Delete a suspect environment and install from a pinned file |
| Clear inventory | One project, one dependency list to scan |
| No system changes | A bad install cannot overwrite OS owned files |
What it does not give you
The documentation describes package and interpreter isolation. It does not describe the environment as a security boundary, and it makes no promise of containing hostile code. A malicious package installed into a venv can still read your home directory, environment variables and cloud credentials, because it runs as you.
If you need containment, use a container or a separate machine, and keep secrets out of the build environment. See what runs on your machine with wheel or source installs for when code executes during install.
A simple routine
- Create an environment inside the project folder.
- Install from a pinned, ideally hash checked, requirements file.
- Keep the environment out of version control.
- When in doubt about what is inside, delete it and rebuild.
Common mistakes
Three habits undo the benefit. Installing with the system interpreter while an environment is active in another terminal puts packages in the wrong place. Copying an environment folder to another machine breaks it, because the documentation says environments are not meant to be moved. And sharing one environment across many projects brings back the pile of unknown packages you were trying to avoid.
A quick test: print the interpreter path before you install anything. If it does not point inside the project folder, stop and activate the right environment.
Try it yourself
Click through it at your own pace, or open it full screen. Notice how one project maps to one clear list of components.
Quick check
Can malware escape a virtual environment?
It does not need to escape. It runs with your user's permissions, so it can reach your files and network.
Should I commit the venv folder?
No. Commit the pinned requirements or lock file and recreate the environment from it.
Safeguard's SBOM and dependency scanning can read a project's pinned file and report known vulnerable packages, with a free scan to start.
Sources
Last reviewed: 19 October 2026.
