If your mobile is old then 1st download the following 3 soft & after another Python soft

PythonForS60_1_4_4_2ndEd.SIS
PythonScriptShell_144_2ndEd.sis
Python_modul_pack_1_25.sis

after download the above soft now your mobile is ready to play .py file or python file in .sis file

Python in sis file
Python in .py file