Identifier rules and variable naming considerations in Python

Naming rules and precautions for naming variables in Python

Python is a simple, easy-to-learn, powerful programming language. Good naming conventions and rules can make The code is more readable and understandable, and the maintainability of the code is improved. This article will introduce the naming rules and variables naming considerations in Python, and give specific code examples.

1. Naming rules:

1. Variable names, function names and module names all use lowercase letters, and words are separated by underscores "_", for example: my_variable, calculate_sum.
2. Class names use camel case naming, with the first letter capitalized, for example: MyClass, CalculateSum.
3. Use capital letters for constant names, and separate words with underscores "_", for example: MAX_NUMBER, PI.

2. Precautions for naming variables:

1. Variable names should be descriptive and be able to clearly express the purpose and meaning of the variable. Try to avoid using single characters or empty characters. Meaningful variable name.
2. Avoid using Python keywords as variable names, such as if, for, while, etc.
3. When naming variables, you can use the abbreviation of English words. If you use an abbreviation, you should ensure that others can understand and recognize the meaning of the abbreviation.
4. Try not to use variable names starting or ending with an underscore "_". Such naming methods are usually used for special purposes, such as private variables or special identifiers.
5. In variable names with multiple words, you can use underscore "_" to separate them, which can improve the readability of the variable name. For example: average_score, employee_number.

The following are some specific code examples showing naming rules and considerations for variable naming:

# 使用小写字母和下划线来命名变量和函数
my_variable = 10
def calculate_sum(a, b):
    return a + b

# 使用驼峰命名法来命名类名
class MyClass:
    def __init__(self, name):
        self.name = name

# 使用大写字母和下划线来命名常量
MAX_NUMBER = 100
PI = 3.14

# 避免使用关键字作为变量名
# 错误示例：
for = 0
print(for)
# 正确示例：
for_value = 0
print(for_value)

# 使用缩写时，确保其他人能理解和识别
# 错误示例：
avg_score = 90
# 正确示例：
average_score = 90

# 避免使用下划线开头或结尾的变量名
# 错误示例：
_my_variable = 10
# 正确示例：
my_variable = 10

# 使用下划线来分隔多个单词的变量名
# 错误示例：
averageScore = 90
# 正确示例：
average_score = 90

By complying with Python’s naming rules and considerations for variable naming, you can Your code is more readable and understandable, and it improves code maintainability. I hope this article can help you name variables and functions better when using Python.

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