Break to debug

Yesterday I had to read a very large file and take some data. Each run was around a minute. So I was losing a minute of my time for every TypeError :-).
In the main loop I just added:

with open(fileName,"r") as f:
    for (i,line) in f:
        #do something here
        if i>2000:
            break

to cut down the run time and debug.

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