this meaning is per convention only and it doesn’t trigger any special behaviors in the Python parser. The single underscore is simply a valid variable name that’s sometimes used for this purpose.
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...
If you don’t do it like this, then you’ll get an error because class is a Python keyword, and you can’t use it with a different purpose in your code.Note: The machine learning library scikit-learn uses a convention where a trailing underscore indicates that an attribute has been ...
The following public attributes are available, their name starts with an underscore to not clash with exported function names: PyDLL._handle The system handle used to access the library. PyDLL._name The name of the library passed in the constructor. Shared libraries can also be loaded by usin...
seen =set()fornameinfield_names:ifname.startswith('_')andnotrename:raiseValueError('Field names cannot start with an underscore: ''%r'% name)ifnameinseen:raiseValueError('Encountered duplicate field name: %r'% name) seen.add(name)# Fill-in the class templateclass_definition = _class_template...
It is often used in plain text-only media (IRC, instant messaging, classical Email) for this purpose. 这个时候 使用下划线 代替空格 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 ...
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 ...
Modules that are designed for use viafrom M import *should use the__all__mechanism to prevent exporting globals, or use the older convention of prefixing such globals with an underscore (which you might want to do to indicate these globals are “module non-public”). ...
A Foolish Consistency is the Hobgoblin of Little Minds 尽信书不如无书 Code Lay-out 代码布局 Indentation 缩进 Tabs or Spaces? 使用制表符还是空格 Maximum Line Length 最大行长 Should a Line Break Before or After a Binary Operator? 在二元运算符之前还是之后分行? Blank Lines 空白行 Imports 模块的...
There are two ways of specifying data values in Python: Literal, Variable Python variable names have some rules: They can contain only these characters: — Lowercase letters (a through z)— Uppercase letters (A through Z)— Digits (0 through 9)— Underscore (_) They are case-sensitive: ...