def is_valid(isbn):
"""Check whether an ISBN 10 or 13 is valid."""
# isbnlib marks any ISBN10 with lowercase 'X' as invalid
isbn = isbn.upper()
try:
stdnum.isbn
except NameError:
pass
else:
try:
stdnum.isbn.validate(isbn)
except (stdnum.isbn.InvalidFormat, stdnum.isbn.InvalidChecksum,
stdnum.isbn.InvalidLength) as e:
raise InvalidIsbnException(str(e))
return True
try:
isbnlib
except NameError:
pass
else:
if isbnlib.notisbn(isbn):
raise InvalidIsbnException('Invalid ISBN found')
return True
raise NotImplementedError(
'ISBN functionality not available. Install stdnum package.')
def _hyphenateIsbnNumber(match):
"""Helper function to deal with a single ISBN."""
isbn = match.group('code')
isbn = isbn.upper()
try:
is_valid(isbn)
except InvalidIsbnException:
return isbn
try:
stdnum.isbn
except NameError:
pass
else:
i = stdnum.isbn.format(isbn)
return i
try:
isbn_hyphenate
except NameError:
pass
else:
try:
i = isbn_hyphenate.hyphenate(isbn)
except (isbn_hyphenate.IsbnMalformedError,
isbn_hyphenate.IsbnUnableToHyphenateError):
return isbn
return i
i = getIsbn(isbn)
i.format()
return i.code
def _isbn10toIsbn13(match):
"""Helper function to deal with a single ISBN."""
isbn = match.group('code')
isbn = isbn.upper()
try:
is_valid(isbn)
except InvalidIsbnException:
# don't change
return isbn
try:
stdnum.isbn
except NameError:
pass
else:
return stdnum.isbn.to_isbn13(isbn)
try:
isbnlib
except NameError:
pass
else:
# remove hyphenation, otherwise isbnlib.to_isbn13() returns None
i = isbnlib.canonical(isbn)
if i == isbn:
i13 = isbnlib.to_isbn13(i)
return i13
# add removed hyphenation
i13 = isbnlib.to_isbn13(i)
i13h = hyphenateIsbnNumbers('ISBN ' + i13)
return i13h[5:]
def is_valid(isbn):
"""Check whether an ISBN 10 or 13 is valid."""
# isbnlib marks any ISBN10 with lowercase 'X' as invalid
isbn = isbn.upper()
try:
stdnum.isbn
except NameError:
pass
else:
try:
stdnum.isbn.validate(isbn)
except stdnum.isbn.InvalidFormat as e:
raise InvalidIsbnException(str(e))
except stdnum.isbn.InvalidChecksum as e:
raise InvalidIsbnException(str(e))
except stdnum.isbn.InvalidLength as e:
raise InvalidIsbnException(str(e))
return True
try:
isbnlib
except NameError:
pass
else:
if isbnlib.notisbn(isbn):
raise InvalidIsbnException('Invalid ISBN found')
return True
getIsbn(isbn)
return True
def _hyphenateIsbnNumber(match):
"""Helper function to deal with a single ISBN."""
isbn = match.group('code')
isbn = isbn.upper()
try:
is_valid(isbn)
except InvalidIsbnException:
return isbn
try:
stdnum.isbn
except NameError:
pass
else:
i = stdnum.isbn.format(isbn)
return i
try:
isbn_hyphenate
except NameError:
pass
else:
try:
i = isbn_hyphenate.hyphenate(isbn)
except (isbn_hyphenate.IsbnMalformedError,
isbn_hyphenate.IsbnUnableToHyphenateError):
return isbn
return i
i = getIsbn(isbn)
i.format()
return i.code
def is_valid(isbn):
"""Check whether an ISBN 10 or 13 is valid."""
# isbnlib marks any ISBN10 with lowercase 'X' as invalid
isbn = isbn.upper()
try:
stdnum.isbn
except NameError:
pass
else:
try:
stdnum.isbn.validate(isbn)
except stdnum.isbn.InvalidFormat as e:
raise InvalidIsbnException(str(e))
except stdnum.isbn.InvalidChecksum as e:
raise InvalidIsbnException(str(e))
except stdnum.isbn.InvalidLength as e:
raise InvalidIsbnException(str(e))
return True
try:
isbnlib
except NameError:
pass
else:
if isbnlib.notisbn(isbn):
raise InvalidIsbnException('Invalid ISBN found')
return True
getIsbn(isbn)
return True
def _hyphenateIsbnNumber(match):
"""Helper function to deal with a single ISBN."""
isbn = match.group('code')
isbn = isbn.upper()
try:
is_valid(isbn)
except InvalidIsbnException:
return isbn
try:
stdnum.isbn
except NameError:
pass
else:
return stdnum.isbn.format(isbn)
def _isbn10toIsbn13(match):
"""Helper function to deal with a single ISBN."""
isbn = match.group('code')
isbn = isbn.upper()
try:
stdnum.isbn
except NameError:
pass
else:
try:
is_valid(isbn)
except InvalidIsbnException:
return isbn
i = stdnum.isbn.to_isbn13(isbn)
return i
try:
isbnlib
except NameError:
pass
else:
try:
is_valid(isbn)
except InvalidIsbnException:
return isbn
# remove hyphenation, otherwise isbnlib.to_isbn13() returns None
i = isbnlib.canonical(isbn)
if i == isbn:
i13 = isbnlib.to_isbn13(i)
return i13
# add removed hyphenation
i13 = isbnlib.to_isbn13(i)
i13h = hyphenateIsbnNumbers('ISBN ' + i13)
return i13h[5:]
try:
is_valid(isbn)
except InvalidIsbnException:
# don't change
return isbn
i1x = getIsbn(isbn)
if not isinstance(i1x, ISBN13):
i13 = i1x.toISBN13()
else:
i13 = i1x
return i13.code
