Rules To Create Identifiers In Python

There are many rules that must be followed to produce a python identifier.


1.You ca n’t use reticent keywords as an identifier name.

2.Python identifier can contain letters in a small case (a-z), upper case (A-Z), integers (0-9), and underscore (,).

3Identifier name ca n’t begin with a number.

4.Identifiers in python ca n’t contain only integers.

5.Python identifier name can start with an underscore.

6.There's no limit on the length of the identifier name.

7.Python identifier names are case sensitive.


Python Valid Identifiers Example

  • ab10c: contains only letters and numbers
  • abc_DE: contains all the valid characters
  • _: surprisingly but Yes, underscore is a valid identifier
  • _abc: identifier can start with an underscore

Python Invalid Identifiers Example

  • 99: identifier can’t be only digits
  • 9abc: identifier can’t start with number
  • x+y: the only special character allowed is an underscore
  • for: it’s a reserved keyword






  • How to Test if a String is a Valid Identifier?

  • We can use string is identifier () function to agree if the identifier name is valid or not. But, this system does n’t take reticent keywords into advisement. So, we can use this function with keyword.iskeyword () to check if the name is valid or not.
  • print("abc".isidentifier())  # True
    print("99a".isidentifier())  # False
    print("_".isidentifier())  # True
    print("for".isidentifier())  # True - wrong output


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