User-Defined Constants To tell other programmers that a given value should be treated as a constant, you must use a widely accepted naming convention for the constant’s identifier or name. You should write the name in capital letters with underscores separating words, as stated in the ...
Convention Module lowercase Class CapWords Functions lowercase Methods lowercase Type variables CapWords Constants UPPERCASE Package lowercase Conclusion Mastering Python best practices is essential for writing clean, efficient, and maintainable code. By following guidelines on code quality, logging, commenting,...
The naming convention for functions may be used instead in cases where the interface is documented and used primarily as a callable. 注意,内建名称有一个单独的约定:大多数内建名称是单个单词(或两个单词一起运行),而CapWords约定仅用于异常名称和内建常量。 8.5 Type Variable Names 在PEP 484中引入的类...
The addition of functools.reduce() as a synonym for the built-in reduce() function. Python 3.0 adds several new built-in functions and changes the semantics of some existing builtins. Functions that are new in 3.0 such as bin() have simply been added to Python 2.6, but existing builtins...
Internal Variables and Constants Exporting global variables in your modules isn’t a good idea. Even though global variables can come in handy in a few use cases, such as global settings, utility scripts, and data caching, they have several drawbacks. For example, global variables can: Make ...
single_trailing_underscore_: used by convention to avoid conflicts with Python keyword, for example,Tkinter.Toplevel(master, class_='ClassName') __double_leading_underscore: when naming a class attribute, invokes name mangling (inside classFooBar,__boobecomes_FooBar__boo). ...
Classes for internal use have a leading underscore in addition. 类:几乎毫无例外的,类名都使用首字母大写开头(Pascal命名风格)的规范。使用_单下划线开头的类名为内部使用,上面说的from M import *默认不被告导入的情况。 Exception Names Because exceptions should be classes, the class naming convention ...
Note that there is a separate convention for builtin names: most builtin names are single words (or two words run together), with the CapWords convention used only for exception names and builtin constants. Type variable names Names of type variables introduced inPEP 484should normally use CapW...
Whenever possible, "What's New in Python" links to the bug/patch item for each change.Python 3.0 The development cycle for Python versions 2.6 and 3.0 was synchronized, with the alpha and beta releases for both versions being made on the same days. The development of 3.0 has influenced ...
Rules and naming convention for variables and constants A name in a Python program is called an identifier. An identifier can be a variable name, class name, function name, and module name. There are some rules to define variables in Python. In Python, there are some conventions and rules ...