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from somewhere import somedata

counter, step = 1, 100
start, stop = 0, step
_len = len(somedata)

print "loop started"
while start < _len:
    print "loop #{0} ({1} to {2})".format(counter, start, stop)

    for data in somedata[start:stop]:
        pass
    
    start += step
    stop += step
    counter += 1

else:
    print "loop finished"