isidentifier( ) FUNCTION

isidentifier() Function

The isidentifier() Function is used to check if the String is a valid identifier.

Note : Just for recap, a valid identifier is the one that contains alphanumeric characters (A to Z or a to z) or numbers (0 to 9) or an underscore. An identifier can never start with a number.

Example :

x = "24A"
if x.isidentifier():
    print("Is an Identifier")
else:
    print("Is not an Identifier")

Output :

Is not an Identifier

In the above code, we have declared a String '24A' which is not an Identifier.

x = "24A"

Now, to check, if the String is an Identifier, we have used 'isidentifier( )' function.

if x.isidentifier():
    print("Is an Identifier")
else:
    print("Is not an Identifier")

And in this case, '24A' is not an Identifier. So, we got the below output.

Is not an Identifier

Similarly, let us look at the next example.

Example :

x = "first_number"
if x.isidentifier():
    print("Is an Identifier")
else:
    print("Is not an Identifier")

Output :

Is an Identifier

In the above code, we have declared a String 'first_number' which is an Identifier.

x = "first_number"

Now, to check, if the String is an Identifier, we have used 'isidentifier()' function.

    if x.isidentifier():
    print("Is an Identifier")
else:
    print("Is not an Identifier")

And in this case, 'first_number' is an Identifier. So, we got the below output.

Is an Identifier

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