Python-Future is a library that supports writing Python 2 and 3 compatible code. This library allows users to utilize a single codebase to support both versions with minimal overhead.

For migrating Python 2 to Python 3 code, the NCSC also recommends the 2to3 application, which attempts to automate the process.

With 35 million lines of Python code, the Athena trading platform is at the core of JPMorgan's business operations. A late start to migrating to Python 3 could create a security risk.