Programming tutorials for people who want code that actually runs, not code that only looks right. Pick a language, start at the beginning, and don't skip the basics. They are where most problems come from.
for line in file reads one line at a time, so a 10 GB file uses almost no memory. read() and readlines() load everything. Count, filter and stop early without building a list, and read in blocks when there are no lines.
Page through a table with keyset pagination: filter on the last row you showed and add a tie-breaker. After this, a later page costs the same as the first and rows do not repeat or vanish between pages.
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