Question: what are the different properties of an identifier in python?
Answer: Identifiers can be a combination of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9) or an underscore _ . ...  An identifier cannot start with a digit. ...  Keywords cannot be used as identifiers. ...  We cannot use special symbols like !, @, #, $, % etc. ...  An identifier can be of any length.