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Python String | isidentifier()
  • Last Updated : 11 Jan, 2018

This in-built function of Python is used to check whether a string is a valid identifier or not. The method returns True if the string is a valid identifier else returns False.
Syntax:

string.isidentifier()

Parameters:

The method does not take any parameters

Return Value:



The method can return one of the two values:

  • True: When the string is a valid identifier.
  • False: When the string is not a valid identifier.
  • The below programs show how the method works.

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    # Python code to illustrate the working of isidentifier()
      
    # String with spaces
    string = "Geeks for Geeks"
    print(string.isidentifier())
      
    # A Perfect identifier
    string = "GeeksforGeeks"
    print(string.isidentifier())
      
    # Empty string
    string = ""
    print(string.isidentifier())
      
    # Alphanumerical string
    string = "Geeks0for0Geeks"
    print(string.isidentifier())
      
    # Beginning with an integer
    string = "54Geeks0for0Geeks"
    print(string.isidentifier())

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    Output:

    False
    True
    False
    True
    False
    

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