Python Identifiers

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• 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.

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Example of legal identifier :

     arena , s_count
     marks40
     class_one

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Example of illegal identifier :

     1sst
     2nd number
     oh!god

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