Clean Names

N1: Choose Descriptive Names

Names should reveal intent. If a name requires a comment, it doesn't reveal its intent.

# Bad - what is d?
d = 86400

# Good - obvious meaning
SECONDS_PER_DAY = 86400

# Bad - what does this function do?
def proc(values: list[int]) -> list[int]:
    return [value for value in values if value > 0]