24 bit signed integer binary conversion help needed

[Robert Somerville]

hi;
I am trying to read 24bit signed WAV format (little endian) data from a 
WAV file and convert it to 32 bit little endian integer format ... can 
anybody please tell me how to do the conversion from 24 bit to 32 bit 
with a snippet of Python code ???

Thanks so much
Robert Somerville