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Identifiers in Python – Definition, Rules, and Examples
Identifiers in Python are the names used to identify variables, functions, classes, modules, and other objects in a program. They act as unique labels so the interpreter can recognize and manage data or code elements. Every programming language uses identifiers, but Python follows a set of specific naming rules and conventions that ensure clean, error-free coding.
✅ Key Rules for Python Identifiers
Can contain letters (A-Z, a-z), digits (0-9), and underscore (_).
Cannot start with a digit.
Case-sensitive → Age, age, and AGE are all different identifiers.
No special characters allowed → @, #, $, %, space, etc.
Cannot use Python keywords (like if, for, class).
Should be meaningful and follow Python naming conventions (snake_case for variables and functions).
✅ Valid vs Invalid Examples
Valid Identifiers Invalid Identifiers
name, student_1, _value 1name, my-name, class, roll no
⭐ Best Practices
Use short but descriptive names: total_price, studentName
Avoid confusing characters like l (lowercase L) and O (uppercase O)
Follow PEP-8 style guidelines
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Identifiers are the building blocks of readable and maintainable Python code. By understanding the rules and conventions of naming, beginners can avoid common syntax errors and write professional, clean Python programs.
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