How can I round to 3 decimal places in python?

Attached is my code. Say I enter 25 for the feet per second prompt.

This is the output.

0.45719999999999994 kilometers per min

I want that number rounded to 3 decimal places.

def ftsecTokmin(x):
return x*0.018288

n = float(input("Enter the speed in feet per second: "))
print(ftsecTokmin(n), "kilometer per min")