import os
fp=open("try.ts","rb")
for i in range(100):
  buf=fp.read(188)
if buf[0]=="x47"
  print "OK"
fp.close()

if buf[0]=="x47"
                ^
SyntaxError: invalid syntax

if buf[0]=="x47":
IndexError: string index out of range

if buf[0]=="x47":
IndexError: string index out of range

with open('wxasrs.mp3','rb') as f:
    print(isinstance(f.read(), str))
    print(isinstance(f.read(), bytes))

False
True