Detailed explanation of variable naming rules in Python language

Detailed explanation of Python language variable naming rules

As a widely used programming language, Python is concise and easy to read. Among them, variable naming rules are a must for developers. Important things to familiarize yourself with and follow. This article will explain the naming rules of Python language variables in detail and provide specific code examples.

1. Basic rules for variable naming

In Python, variable naming needs to follow the following basic rules:

1.1 Can only consist of letters, numbers and underscores Composition;
1.2 It cannot start with a number;
1.3 It is case-sensitive, for example, the variable apple and the variable Apple are different;
1.4 You cannot use keywords in Python as variable names, such as if, for, etc. ;
1.5 Chinese characters can be used as variable names, but their use is not recommended to prevent encoding problems in other system environments;
1.6 Variable names should be descriptive to enhance code readability.

The following are several examples of variable naming that comply with the rules:

age = 18
name = 'Tom'
is_student = True
price_2 = 9.99

2. Use underline naming

In Python, underline naming is variable naming common way. Underline nomenclature uses a combination of lowercase letters and underscores to make variable names more readable.

The following are several examples of variables using underscore nomenclature:

user_name = 'John'
total_score = 95.5
is_valid = True

3. Use camel case nomenclature

In addition to underscore nomenclature, camel case nomenclature It is also a naming method commonly used by Python developers. Camel case nomenclature is divided into two types: small camel case nomenclature and large camel case nomenclature.

3.1 Little camel case nomenclature

The little camel case nomenclature lowercases the first letter of the variable and capitalizes the first letter of each word.

The following are several examples of variables using small camel case naming:

userName = 'Lucy'
totalScore = 85.5
isValid = True

3.2 Big camel case naming

Big camel case naming uses the first letter of each word of the variable All capitalized.

The following are several examples of variables using camel case naming:

StudentName = 'Mike'
GradePointAverage = 3.8
IsPassed = True

4. Notes

In Python, you need to pay attention to the following when naming variables Matters:

4.1 Variable names should be descriptive to enhance code readability;
4.2 Do not use a single character as a variable name, such as a, b, etc., unless in the case of temporary variables ;
4.3 Do not use Chinese pinyin to name variables to maintain code consistency;
4.4 Try to avoid using variable names that are too long to prevent the code from being too verbose.

The above is a detailed explanation of the naming rules of Python language variables, and provides specific code examples. I hope it will be helpful to everyone in the Python programming process. When naming variables, always follow the rules to write clearer and easier-to-understand code, improving code quality and maintainability.

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