Write a Python function that accepts a username as input and raises an exception if the username contains any special characters.
Example 1:
Input: "user@name" Output: "Error: Username should not contain any special characters."
Example 2:
Input: "username" Output: "Valid username."
Use Python’s built-in functions to check if each character in the string is alphanumeric.
def validate_username(username):
if not username.isalnum():
raise Exception("Error: Username should not contain any special characters.")
else:
return "Valid username."
print(validate_username("user@name")) # Output: "Error: Username should not contain any special characters."
print(validate_username("username")) # Output: "Valid username."
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