The isidentifier Method: Checking if a String is a Python Identifier

Determines if a string is an identifier, returning True or False.

isidentifier()¶

This method checks if a string is a valid Python identifier. For more details on identifiers and keywords, see the original documentation section Identifiers and keywords.

'continue'.isidentifier()  # True
'cat'.isidentifier()  # True
'function_name'.isidentifier()  # True
'ClassName'.isidentifier()  # True
'_'.isidentifier()  # True
'number1'.isidentifier()  # True
'1st'.isidentifier()  # False
'*'.isidentifier()  # False

To determine if a string is a reserved keyword (e.g., def, class), use keyword.iskeyword().