From Forum Nokia Wiki

If you want know the product code of your phone you can dial

*#0000#

In python you use :

>>> import sysinfo
>>> sysinfo.sw_version()
u'V 3.42.1 16-10-03 NHL-10 (c) NMP'

But if you want to know the phone model more understandable like 6660 for NHL-10 you need this firmware module :

You can use it like this :

>>>import firmware
>>>firmware.phone_model
>>>'6600'

Issue : Don't work with N80 (FNKI issue ???)

links : All Nokia phone models with their product code