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Yes, and we picked a comma. You?

That sentence must have a typo in it, right?

Wikipedia [1] doesn't list any country that does use the colon (:) as the decimal separator, so possibly the period/dot (.) as used in most English-speaking countries, was meant?

1: https://en.wikipedia.org/wiki/Decimal_separator

Yeah, I think what author meant "some countries don't use the period but a comma, thus hilarity ensues" (especially when your code respects the locale and the csv file is written in append mode)

Like the metric system?

The metric system, being French in origin, would certainly use the comma!