什么是dunder？

阅读python文档，常常看到dunder这个词，查字典，无！晕死......今天终于找到了这个词的出处。

原来dunder是 Double UNDERscore（中文双下划线）的缩写，分别取Double的D 和 Underscore的Under组成。这样取名后方便发音。

在发明 dunder 之前， __init__ 要念作 double underscore init，其中的double underscore 有17个单词，发音是6声（嘴或舌头要变换7次动作，你可以以试试），而dunder 只有6个单词，发音是2声。大大降低了手和嘴的劳动量，这个好的发明，当然举双手占成了。

python官方的wiki做如下说明：

Dunder (Double UNDERscore) Alias
Mark Jackson was the first to suggest dunder as a speech shorthand for double underscores (__) in a reply to a query from Pat Notz. Ned Batchelder later stressed the need for a way of pronouncing __:
An awkward thing about programming in Python : there are lots of double underscores. [snip] My problem with the double underscore is that it's hard to say. How do you pronounce __init__? "underscore underscore init underscore underscore"? "under under init under under"? Just plain "init" seems to leave out something important. I have a solution: double underscore should be pronounced "dunder". So __init__ is "dunder init dunder", or just "dunder init".

PEP8中就有对dunder的说明，现在知道在说什么了。

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