CS50 DNA works for small.csv but not for large

Question

I am having problems with CS50 pset6 DNA. It is getting all the right values and gives correct answers when I use the small.csv file but not when I use the large on

Answer 1

earik87 is absolutely right! Just I like to add, the code is missing an = to work for all the cases especially when you have redundant sequences.

while i < len(samples):
    hold = samples[i:(i + size)]
    if hold == keys:
        run += 1
        #ensure the code does not go outside len of samples **( I added =)**
        if ((i + size) <= len(samples)):
            i = i + size
        continue
    else: #only if there is no longer sequence match, check this.
        if run > longest:
            longest = run
            run = 0
        else: #if the number of sequence match is still smaller then longest, then make run zero.
            run = 0
    i += 1