https://stackoverflow.com/questions/43487811/what-is-python-dot-dot-notation-syntax
f = 1..__add__但是写作是一样的：
f = 1.0.__truediv__因为float文字可以写成三种形式：
normal_float = 1.0
short_float = 1. # == 1.0
prefixed_float = .1 # == 0.1python ..
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