How to validate an SSN in Python?

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import re


def is_valid_ssn(ssn):
    # Compile the regular expression for an SSN
    ssn_regex = re.compile(r"^\d{3}-\d{2}-\d{4}$")

    # Check if the input SSN matches the regular expression
    if ssn_regex.match(ssn):
        return True
    else:
        return False


# Test the validate_ssn function
valid_ssn = "123-45-6789"
invalid_ssn = "123-456-789"

# Output: True
print(is_valid_ssn(valid_ssn))

# Output: False
print(is_valid_ssn(invalid_ssn))