Improved logic for iterating over 'pairs.txt' #64
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Instead of loading the entire file into the memory, use the iterator object natively provided by the file object returned by the open function. - This saves memory. - Avoid __getitem__ call, improve performance.
The inner loop used `range(len(imglist))`, this iterates over the entire length twice. Using `enumerate` saves one complete iteration. Furthermore, inside the inner loop `__getitem__` and `__setitem__` were being called twice in each iteration. Reduces `__getitem__` calls to 0, as it is already being taken care by for loop, and reduced `__setitem__` to 1.
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closes #62
closes #63
Instead of loading the entire file into the memory, use the iterator
object natively provided by the file object returned by the open
function.