我对 Python 语言比较陌生，在执行以下操作时遇到了这个问题：
help(list)
这是我遇到的情况：
__add__(...)
| x.__add__(y) <==> x+y
|
| __contains__(...)
| x.__contains__(y) <==> y in x
|
| __delitem__(...)
| x.__delitem__(y) <==> del x[y]
关于这些，下划线是做什么用的？因为（据我所知）当您正常使用方法时不会使用它们，所以我很难理解为什么他们会花时间在文档中用下划线写出它们。
See Python 风格指南 http://www.python.org/dev/peps/pep-0008/以获得全面的解释。
在实践中：
the following special forms using leading or trailing
underscores are recognized (these can generally be combined with any case
convention):
- _single_leading_underscore: weak "internal use" indicator. E.g. "from M
import *" does not import objects whose name starts with an underscore.
- single_trailing_underscore_: used by convention to avoid conflicts with
Python keyword, e.g.
Tkinter.Toplevel(master, class_='ClassName')
- __double_leading_underscore: when naming a class attribute, invokes name
mangling (inside class FooBar, __boo becomes _FooBar__boo; see below).
- __double_leading_and_trailing_underscore__: "magic" objects or
attributes that live in user-controlled namespaces. E.g. __init__,
__import__ or __file__. Never invent such names; only use them
as documented.
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