Python Identifiers

• Identifiers are programmer defined tokens.
• They are used fro naming classes, methods, variables, module,packages etc.. in a program.

Rules for a Legal Identifier :

1. They can be a set of alphabet, digits and underscore ( _ ) character.

2. They must not begin with digit .

3. Since Python is case sensitive language, Uppercase and Lowercase letters are distinct.

4. They can be of any length.

5. They must not be a keyword.

Example of legal identifier :

Example of illegal identifier :