摘要：电子排版领域 The underscore is not the same character as the dash character, although one convention for text news wires is to use an un

重新赋值 __builtins__ = 1

绝望

本地 locals

结果

import os

删除变量

__builtins__ = 1 del __builtins__

可读性

加空格的原因 import this

具体规范

pep8

下划线来历

电子排版领域 The underscore is not the same character as the dash character, although one convention for text news wires is to use an underscore when an em-dash or en-dash is desired, or when other non-standard characters such as bullets would be appropriate. A series of underscores [like -___ ] may be used to create a blank to be filled in on a form, although the resulting blank may have tiny gaps between each individual underscore. It is also sometimes used to create a horizontal line; other symbols with similar graphemes, such as hyphens and dashes, are also used for this purpose.

计算机时代

This character is sometimes used to create visual spacing within a sequence of characters, where a whitespace characteris not permitted (e.g., in computer filenames, email addresses, and in Internet URLs). Some computer applications will automatically underline text surrounded by underscores: underlined will render underlined. It is often used in plain text-only media (IRC, instant messaging, classical Email) for this purpose.

When the underscore is used for emphasis in this fashion, it is usually interpreted as indicating that the enclosed text is underlined (as opposed to being italicized or bold, which is indicated by /slashes/ or asterisks, respectively).

总结

来源：oeasy