Cloud Composer supports Python 2 and Python 3.
To see the
major.minor.patch versions of Python 2 and Python 3 used in a
specific Cloud Composer image, see
Cloud Composer version list.
How Python versioning works
You can create environments based on Python 2 and Python 3 in the same Google Cloud project. Each environment can use only one major Python version: Python 2 or Python 3.
You can specify the major Python version when you create a new Cloud Composer environment.
After an environment is created, you cannot change the environment's major Python version. In addition, it is not possible to switch an existing environment to a different minor Python version.
About Python 2 support
Cloud Composer supports Python 2, and will continue to do so until Airflow stops supporting it. However, Python 2 reached end-of-life on January 1, 2020, which can lead to supportability limitations for Python 2 environments.
New Airflow operators, sensors, and hooks are only developed for Python 3, which may cause connectivity options to be outdated for Python 2 environments. As such, we highly recommend migrating your DAGs to a Python 3 environment, and creating all new environments with Python 3.
How Python versions affect DAGs and dependencies
When you install Python dependencies from the Python Package Index,
the environment's Python version determines which pip installs the package.
For example, Python 3 uses pip3. In addition, the
pip command points
Because the Python 3 package includes Python 2,
the issue of which Python interpreter to use arises
For Python 3 environments, the
python command points to