Sun May 31 22:07:19 2026
Sun May 31 22:07:19 2026

isbn13_code_test():
  numpy version:  1.26.4
  python version: 3.10.12
  Test isbn13_code().

isbn13_check_digit_test():
  isbn13_check_digit() calculates the 13-th digit
  (the check digit) of a 13-digit ISBN.

  Check digit of "978-0-306-40615-2?" is "7", expecting "7"
  Check digit of "978 0 8493 9640?" is "3", expecting "3"
  Check digit of "978158488059?" is "2", expecting "2"
  Check digit of "978246897531?" is "1", expecting "1"
  Check digit of "978135798642?" is "1", expecting "1"

isbn13_is_valid_test():
  isbn13_is_valid() reports whether an ISBN13 is valid.

  Validity of "978-0-306-40615-7" is  True , expecting  True
  Validity of "978-0-326-80615-7" is  False , expecting  False
  Validity of "978 0 8493 9640 3" is  True , expecting  True
  Validity of "978 0 8493 9640 9" is  False , expecting  False
  Validity of "978-0-3878-9654-0" is  True , expecting  True

s_to_digits_test():
  s_to_digits() converts string to digit vector

  Test string: "34E94-70.6"
  Extracted 5 digits
array([3, 4, 9, 4, 7], dtype=int32)

  Test string: "34E94-70.6"
  Extracted 7 digits
array([3, 4, 9, 4, 7, 0, 6], dtype=int32)

isbn13_code_test():
  Normal end of execution.
Sun May 31 22:07:19 2026