The Role of Identifiers in Python Programming
Python Token Identifiers
In Python, an identifier is a name given to a variable, function, or other object. Identifiers are used to identify and access these objects in the code. Python has certain rules for creating identifiers:
Rules for Python Identifiers
1. Start with a letter or underscore: Identifiers must start with a letter (a-z or A-Z) or an underscore (_).
2. Letters, digits, and underscores only: Identifiers can only contain letters, digits (0-9), or underscores.
3. No special characters: Identifiers cannot contain special characters like !, @, #, $, etc.
4. No reserved keywords: Identifiers cannot be reserved keywords like "if", "for", "while", etc.
Sample MCQ Question
Which of the following is a valid identifier in Python?
A) 1st_variable
B) variable_name
C) @symbol
D) None of the above
Answer: B) variable_name
Explanation: variable_name is the correct answer because it follows the rules for Python identifiers. It starts with a letter, contains only letters and underscores, and is not a reserved keyword. 1st_variable is incorrect because it starts with a digit. @symbol is incorrect because it contains a special character.
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