How can I use Python to decode a rs 232 capture (trace)

How can I use Python to decode a rs 232 capture (trace)

I'm attempting to use Python (2.7) to decode a trace I captured with a
FrontLine-ComProbe USB rs232 device. I tried:
import binascii
my_file = open('c:\\My_Trace.cfa', 'r')
aString = my_file.read()
comp = binascii.b2a_qp(aString)
I'm not getting the ascii I was expecting; it's non-human readable text.
Can someone please give me direction .... Thanks!