Python - To find region between start.start and end.start

[vivek srinivas]

for my code

for orf in [mydna[start.start():end.start()+3] for start in re.finditer('(?=ATG)',mydna
           for end in re.finditer('(?=TAA|TAG|TGA)',mydna if end.start()>start.start() and (end.end()-start.start())%3 == 0]:
        #print orf

How to make the program stop at the first end regions .

[Glenton]

Hard to engage with this level of detail, but let me try. You probably want to add in a line like this:

if orf==ConditionMeaningFirstEndRegion:
    break

The key word I suppose you're looking for is "break" which takes you out of the loop.