venv

Create virtual environment

$ python -m venv [venv]

$ python -m venv --system-site-packages [venv]

$ source [venv]/bin/activate

$ source [venv]/bin/activate.fish

$ deactivate

$ python -m venv --clear [venv]

python -m venv [--system-site-packages] [--clear] path

venv creates lightweight Python virtual environments that isolate project dependencies from the system Python installation. Each virtual environment has its own site-packages directory and can have different versions of packages installed without conflicts.
The module is part of the Python standard library and requires no additional installation. Activation scripts modify the shell's PATH to use the virtual environment's Python and pip, and deactivate returns to the system environment.

--system-site-packages

Include system packages.

Clear existing.

Don't install pip.

Upgrade scripts.

Custom prompt.

Python 3.3+. Use virtualenv for older. Path specific.

venv was added to Python 3.3 standard library as the recommended way to create virtual environments.

virtualenv(1), pip(1), python(1)