$ ng 赵本山 宋丹丹
name: 赵本山 => gender: male, probability: 0.9836229687547046
name: 宋丹丹 => gender: female, probability: 0.9759486128949907

>>> import ngender
>>> ngender.guess('赵本山')
('male', 0.9836229687547046)

>>> ngender.guess('宋丹丹')
('female', 0.9759486128949907)

>>> %timeit guess('宋丹丹')
100000 loops, best of 3: 4.01 µs per loop

P(gender=男|name=本山) 
= P(name=本山|gender=男) * P(gender=男) / P(name=本山)
= P(name has 本|gender=男) * P(name has 山|gender=男) * P(gender=男) / P(name=本山)

>>> ngender.guess('李胜男')
('male', 0.851334658742)

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_Command 'ng' not found, but can be installed with:
sudo apt install ng-common_

假设事件 A = name has 本，
假设事件 B = name has 山，
得到事件 C = A ∩ B = {name=本山, name=山本} ≠ {name=本山} 。

加上事件 A 与事件 B 很明显独立，
P(A ∩ B|gender=男) = P(A|gender=男) * P(B|gender=男) = P(name has 本|gender=男) * P(name has 山|gender=男) ≠ P({name=本山}|gender=男)