Set difference: Data provided from two big files with one number at a line

Today, I had to find out difference between two huge lists of numbers.
Numbers are 17 digits long and list are of around 1 lac.

PS: I'm documenting both versions here for my future reference.

I used python, because diff doesn't felt good for me. because it will print both ins and outs of both files. Also, I ruled out diff's possibility, because I didn't felt it will work at that time.

Later, at home: I give diff a try.
Yes, it's not that beautiful as in python. I'd cut and sed a bit.
But still, it's a "one liner" and I like 'em a lot.

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