




def 					lowerCamelCase__       (						A__       :					str	):





       '''simple docstring'''



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




def 					lowerCamelCase__       (						A__       :					str	):





       '''simple docstring'''



       __lowerCamelCase   =						credit_card_number
       __lowerCamelCase   =						0
       __lowerCamelCase   =						len(A__	) - 2
       for i in range(A__  ,			-1  ,			-2	):
              #  double the value of every second digit
              __lowerCamelCase   =						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
              __lowerCamelCase   =						cc_number[:i] + str(A__	) + cc_number[i + 1 :]
              total += digit

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

       return total % 10 == 0




def 					lowerCamelCase__       (						A__       :					str	):





       '''simple docstring'''



       __lowerCamelCase   =						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(A__	) <= 16:
              print(f'{error_message} of its length.'	)
              return False

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

       if not luhn_validation(A__	):
              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 transformers import DistilBertTokenizer, DistilBertTokenizerFast
from transformers.testing_utils import require_tokenizers, slow

from ..bert.test_tokenization_bert import BertTokenizationTest





@require_tokenizers
class     lowerCamelCase__(					__lowerCamelCase):
      UpperCAmelCase__      :	Dict    		=   DistilBertTokenizer
      UpperCAmelCase__      :	Dict    		=   DistilBertTokenizerFast
      UpperCAmelCase__      :	Tuple    		=   True
      @slow
      def 			lowerCAmelCase__						(				self: Tuple   ):
             __lowerCamelCase   =						DistilBertTokenizer.from_pretrained("""distilbert-base-uncased"""   )

             __lowerCamelCase   =						tokenizer.encode("""sequence builders"""    ,       add_special_tokens=UpperCamelCase_   )
             __lowerCamelCase   =						tokenizer.encode("""multi-sequence build"""    ,       add_special_tokens=UpperCamelCase_   )

             __lowerCamelCase   =						tokenizer.build_inputs_with_special_tokens(UpperCamelCase_   )
             __lowerCamelCase   =						tokenizer.build_inputs_with_special_tokens(UpperCamelCase_    ,       UpperCamelCase_   )

             assert encoded_sentence == [tokenizer.cls_token_id] + text + [tokenizer.sep_token_id]
             assert encoded_pair == [tokenizer.cls_token_id] + text + [tokenizer.sep_token_id] + text_a + [
                 tokenizer.sep_token_id
             ]

