Virtual Environment Setup¶
This page describes how to create a Python virtual environment.
Using a virtual environment is strongly recommended because it allows maintaining an isolated environment in which FiftyOne and its dependencies can be installed. FiftyOne has a variety of dependencies, some versions of which may conflict with versions already installed on your machine.
Creating a virtual environment using
First, identify a suitable Python executable. On many systems, this will be
python3 , but it may be
python on other systems instead. To confirm your
Python version, pass
--version to Python. Here is example output from running
$ python --version Python 2.7.17 $ python3 --version Python 3.6.9
In this case,
python3 should be used in the next step.
Navigate to a folder where you would like to create the virtual environment.
Using the suitable Python version you have identified, run the following to
create a virtual environment called
env (you can choose any name):
python3 -m venv env
python3 at the beginning of a command if your Python executable has a
different name. This will create a new virtual environment in the
with standalone copies of Python and pip, as well as an isolated location to
install packages to. However, this environment will not be used until it is
activated. To activate the virtual environment, run the following command:
After running this command, your shell prompt should begin with
(env) , which
indicates that the virtual environment has been activated. This state will only
affect your current shell, so if you start a new shell, you will need to
activate the virtual environment again to use it. When the virtual environment
python without any suffix will refer to the Python version you
used to create the virtual environment, so you can use this for the remainder
of this guide. For example:
$ python --version Python 3.8.3
Also note that
pip live inside the
env folder (in this output,
the path to the current folder is replaced with
Before you continue, you should upgrade
pip and some related packages in the
virtual environment. FiftyOne’s packages rely on some newer pip features, so
older pip versions may fail to locate a downloadable version of FiftyOne
entirely. To upgrade, run the following command:
pip install --upgrade pip setuptools wheel
To leave an activated virtual environment and return to using your system-wide
Python installation, run
deactivate. For more documentation on
including additional setup options,
There are lots of ways to set up and work with virtual environments, some of which are listed here. These may be particularly useful to review if you are dealing with virtual environments frequently:
There is a similar virtualenv package (
pip install virtualenv) that supports older Python versions.
virtualenvwrapper adds some convenient shell support for creating and managing virtual environments.
We currently discourage using
pipenv with FiftyOne, as it has known issues
with installing packages from custom package indices.