Python String isidentifier() Method

The Python isidentifier() method is a string method that returns True if the string is a valid identifier, otherwise False. A string is considered a valid identifier if it only contains alphanumeric letters (a-z) and (0-9), or underscores (_). A valid identifier cannot start with a number, or contain any spaces. Identifiers are used to name variables, functions, classes, modules, etc. in Python.

Here are some examples of using the isidentifier() method:

# Example 1: A simple example of identifier testing using isidentifier() method[^3^][1]
# Variable declaration
str = 'abcdef'
# Calling function
if str.isidentifier() == True:
    print("It is an identifier")
else:
    print("It is not identifier")
# Output: It is an identifier

# Example 2: The isidentifier() method will return False if the string contains spaces or starts with a number[^1^][2] [^4^][4]
print('Py thon'.isidentifier())
print('22Python'.isidentifier())
# Output: False
# Output: False

# Example 3: The isidentifier() method will return True if the string contains underscores regardless of its position[^4^][4]
print('JamesBond_007'.isidentifier())
print('_hello_world'.isidentifier())
# Output: True
# Output: True

If you have any questions about this code, you can drop a line in comment.

 

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