Identifiers(also referred to asnames) 英 /aɪˈdentɪfaɪə(r)/ 美 /aɪˈdentɪfaɪər/ 给变量variable、类class、对象object、方法method、函数function等取名(标识符)时有以下规则: 第一个字符必须是字母表中字母或下划线 _ 。 标识符的其他的部分由字母、数字和下划线组成。 标识符对...
Python 保留字 reserved words, orkeywords 保留字即关键字,我们不能把它们用作任何标识符名称。Python 的标准库提供了一个 keyword 模块,可以输出当前版本的所有关键字: AI检测代码解析 >>> import keyword >>> keyword.kwlist ['False', 'None', 'True', 'and', 'as', 'assert', 'break', 'class', ...
标识符:Identifiers 标识符由字母,数字,和下划线_三种不同的符号各种排列组合成。是程序员自己创造出来的,便于写程序。 特点: 1、字母区分大小写, A 和a是不同的标识符 2、标识符不可以用数字开头,比如8abc是错误的标识符 3、没有长度限制 用处: 用于作为变量,函数名,类名,方法名等 关键字:Keywords 关键字:...
'keywords': ['toml'], 'urls': {'Homepage': 'https://github.com/hukkin/tomli', 'PyPI': 'https://pypi.org/project/tomli'}}} You use load() to read and parse a TOML file by passing a file pointer to the function. Note that the file pointer must point to a binary stream...
When parsing code, the Python interpreter breaks the input up into tokens. Informally, tokens are just the language elements that you have seen so far: identifiers,keywords, literals, and operators. Typically, what separates tokens from one another is whitespace: blank characters that provide empty...
9. Python Keywords and Identifiers 10. Assert Keyword in Python 11. Comments in Python 12. Escape Sequence in Python 13. Print In Python 14. Python-if-else-statement 15. Python for Loop 16. Nested for loop in Python 17. While Loop in Python 18. Python’s do-while Loop 19. Break in...
2.1.7 缩进(Indentation) 2.1.8 符号间的空白(Whitespace between tokens) 2.2 其它符号(Other tokens) 2.3 标识符和关键字(Identifiers and keywords) 2.3.1 关键字(Keywords) 2.3.2 保留的标识符类型(Reserved classes of identifiers) 2.4 字面值(Literals) ...
Misspelled keywords and missing keywords often result in that mysteriousinvalid syntax, but extra keywords can cause trouble as well. You can't use reserved words as variable names in Python: >>>class= "druid"File"<stdin>", line1class= "druid"^SyntaxError:invalid syntax ...
For Python 3.0 and beyond, the following policy is prescribed for the standard library (see PEP 3131): All identifiers in the Python standard library MUST use ASCII-only identifiers, and SHOULD use English words wherever feasible (in many cases, abbreviations and technical terms are used which ...
3.2 标识符(Identifiers)和关键字(保留字,Keywords) 标识符就是名字,用来命名变量、函数、类、模块以及其他对象。标识符包含大小写英文,数字和下划线(_)的组合,不能用数字开头。 关键字,已经被赋予特定意义的单词,不能用作标识符。 3.3 注释(Comments)和缩进(Indentation) 注释用来提示或解释代码的作用和功能。执行...