exception during iteration loop

[Skaperen]

i open a file for reading and read it like:

i=open(ifn)
for line in i:
    ...
    ...

it reads over 352000 lines then gets a UnicodeDecodeError exception. i just want to skip that. if it were some statement in the loop body i would put in a try: and do except: pass. but this is the loop control itself. how can i skip the exception this?