This is an unofficial Python 3.4.10 installation package for Windows.
Python 3.4.10 is officially the last version of Python 3.x for Windows XP. It is officially only available as source code; the last official precompiled version is 3.4.4. The last version of Python 2.x (2.7.18) also works on Windows XP and is newer.
Please read the included Readme.txt file before installing.
Download (updated on January 31, 2020 to include the last versions of pip, setuptools, and wheel for Python 3.4.x)
You may be able to run Python 3.5 or later with XomPie, but I have not tried it yet. There may also exist other unofficial adaptations of later versions for Windows XP.