Python round() built-in function
From the Python 3 documentation
Return number rounded to ndigits precision after the decimal point. If ndigits is omitted or is None, it returns the nearest integer to its input.
>>> round(1.4) # 1 >>> round(1.5) # 2 >>> round(2.1) # 2 >>> round(2.9) # 3 >>> round(2/3, ndigits=3) # 0.667
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