What are Python variable naming rules?

In Python, variable naming follows specific rules and conventions:

Naming Rules:

1. Start with a Letter or Underscore: Variable names must begin with a letter (a-z, A-Z) or an underscore (_).

   • Valid: myVariable, _myVariable
   • Invalid: 1stVariable

2. Followed by Letters, Digits, or Underscores: After the first character, you can use letters, digits (0-9), and underscores.

   • Valid: var1, my_var2
   • Invalid: my-var (hyphen is not allowed)

3. Case Sensitivity: Variable names are case-sensitive. myVar and myvar are considered different variables.

4. No Special Characters: Variable names cannot contain special characters (like @, $, %, etc.) or spaces.

5. No Reserved Keywords: You cannot use Python reserved keywords (like if, for, while, class, etc.) as variable names.

Naming Conventions:

• Descriptive Names: Use meaningful names that describe the variable's purpose (e.g., total_price, user_age).
• Snake Case: For multi-word variable names, use snake_case (e.g., my_variable).
• Avoid Single Character Names: Except for loop counters or temporary variables, avoid using single letters like x or y.

Following these rules and conventions helps make your code more readable and maintainable. If you have more questions, feel free to ask!