def        lowerCAmelCase_			(					__A							)					->    bool:







      '''simple docstring'''


      return credit_card_number.startswith(("34", "35", "37", "4", "5", "6")							)




def        lowerCAmelCase_			(					__A							)					->    bool:







      '''simple docstring'''


      UpperCAmelCase__								=  credit_card_number
      UpperCAmelCase__								=  0
      UpperCAmelCase__								=  len(_UpperCamelCase							) - 2
      for i in range(_UpperCamelCase,  -1,  -2							):
            #  double the value of every second digit
            UpperCAmelCase__								=  int(cc_number[i]							)
            digit *= 2
            # If doubling of a number results in a two digit number
            # i.e greater than 9(e.g., 6 × 2 = 12),
            # then add the digits of the product (e.g., 12: 1 + 2 = 3, 15: 1 + 5 = 6),
            # to get a single digit number.
            if digit > 9:
                  digit %= 10
                  digit += 1
            UpperCAmelCase__								=  cc_number[:i] + str(_UpperCamelCase							) + cc_number[i + 1 :]
            total += digit

      # Sum up the remaining digits
      for i in range(len(_UpperCamelCase							) - 1,  -1,  -2							):
            total += int(cc_number[i]							)

      return total % 10 == 0




def        lowerCAmelCase_			(					__A							)					->    bool:







      '''simple docstring'''


      UpperCAmelCase__								=  f"""{credit_card_number} is an invalid credit card number because"""
      if not credit_card_number.isdigit():
            print(f"""{error_message} it has nonnumerical characters."""							)
            return False

      if not 13 <= len(_UpperCamelCase							) <= 16:
            print(f"""{error_message} of its length."""							)
            return False

      if not validate_initial_digits(_UpperCamelCase							):
            print(f"""{error_message} of its first two digits."""							)
            return False

      if not luhn_validation(_UpperCamelCase							):
            print(f"""{error_message} it fails the Luhn check."""							)
            return False

      print(f"""{credit_card_number} is a valid credit card number."""							)
      return True


if __name__ == "__main__":
      import doctest

      doctest.testmod()
      validate_credit_card_number('4111111111111111')
      validate_credit_card_number('32323')




from typing import TYPE_CHECKING

from ...utils import _LazyModule


UpperCamelCase__    							= {'tokenization_bertweet': ['BertweetTokenizer']}


if TYPE_CHECKING:
      from .tokenization_bertweet import BertweetTokenizer

else:
      import sys

      UpperCamelCase__    							= _LazyModule(__name__, globals()['__file__'], _import_structure, module_spec=__spec__)



