about 20, if you ask me, if you use tabs, you already are mixing tabs and spaces. 2 and 3 with coution, don't give a long name to a to variable for a 3-line for loop, i and j are just fine; we don't like 30-long variable names either, just adding two of them takes the whole line, and average_of_anual_income_after_taxes is way too much, good judgement is always required.
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about 20, if you ask me, if you use tabs, you already are mixing tabs and spaces. 2 and 3 with coution, don't give a long name to a to variable for a 3-line for loop, i and j are just fine; we don't like 30-long variable names either, just adding two of them takes the whole line, and
average_of_anual_income_after_taxes
is way too much, good judgement is always required.