15 – Round to pretty whole numbers

The built-in round can be used to round numbers to nice, pretty integers. More concretely, you can use round to round numbers to powers of 10.

For example, to round \(1374 to \)1400 you would do round(1374, -2).

The second argument of round, which must be an integer, will give you the power of 0.1 that the number will be rounded to:

| n | 0.1 ** n | | | | | 2 | 0.01 | | 1 | 0.1 | | 0 | 1 | | -1 | 10 | | -2 | 100 |