One of the few that I remember is fractions.gcd() -> math.gcd().

See https://docs.python.org/3.0/library/fractions.html#fractions... , https://docs.python.org/3.5/library/fractions.html#fractions... , https://docs.python.org/3.9/library/fractions.html (gone), https://docs.python.org/3.5/library/math.html#math.gcd