As of 18 July 2019 Python 2 is officially deprecated for running CommCare HQ. The CommCare HQ team will continue to maintain backwards compatibility with Python 2 for the next one month after which we will not be able to guarantee compatibility.
This means that if your environment is still running Python 2 after the 22nd of August 2019 you may no longer be able to deploy code updates without risking compatibility issues.
The version of CommCare HQ you are running will continue to work but newer versions may be incompatible with Python 2.
We have documented the steps to upgrade using