Identifiers are names used to identify a variable, function, or other entities in a program.


The rules for naming an identifier in Python are as follows: 

  • The name should begin with an uppercase or a lowercase alphabet or an underscore sign (_). This may be followed by any combination of characters a–z, A–Z, 0–9 or underscore (_). Thus, an identifier cannot start with a digit. 
  • It can be of any length
  • It should not be a keyword or reserved word
  • We cannot use special symbols like !, @, #, $, %, etc., in identifiers.

Examples of identifiers:

  • area
  • _breadth
  • mark_1


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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.