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.
Examples
>>> 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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