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"""Module: barcode.isxn
:Provided barcodes: ISBN-13, ISBN-10, ISSN
This module provides some special codes, which are no standalone barcodes.
All codes where transformed to EAN-13 barcodes. In every case, the checksum
is new calculated.
Example::
>>> from barcode import get_barcode
>>> ISBN = get_barcode('isbn10')
>>> isbn = ISBN('0132354187')
>>> isbn
'0132354187'
>>> isbn.get_fullcode()
'9780132354189'
>>> # Test with wrong checksum
>>> isbn = ISBN('0132354180')
>>> isbn
'0132354187'
"""
from barcode.ean import EuropeanArticleNumber13
from barcode.errors import BarcodeError
from barcode.errors import WrongCountryCodeError
__docformat__ = "restructuredtext en"
class InternationalStandardBookNumber13(EuropeanArticleNumber13):
"""Initializes new ISBN-13 barcode.
:parameters:
isbn : String
The isbn number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "ISBN-13"
def __init__(self, isbn, writer=None) -> None:
isbn = isbn.replace("-", "")
self.isbn13 = isbn
if isbn[:3] not in ("978", "979"):
raise WrongCountryCodeError("ISBN must start with 978 or 979.")
if isbn[:3] == "979" and isbn[3:4] not in ("1", "8"):
raise BarcodeError("ISBN must start with 97910 or 97911.")
super().__init__(isbn, writer)
class InternationalStandardBookNumber10(InternationalStandardBookNumber13):
"""Initializes new ISBN-10 barcode. This code is rendered as EAN-13 by
prefixing it with 978.
:parameters:
isbn : String
The isbn number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "ISBN-10"
digits = 9
def __init__(self, isbn, writer=None) -> None:
isbn = isbn.replace("-", "")
isbn = isbn[: self.digits]
super().__init__("978" + isbn, writer)
self.isbn10 = isbn
self.isbn10 = f"{isbn}{self._calculate_checksum()}"
def _calculate_checksum(self):
tmp = sum(x * int(y) for x, y in enumerate(self.isbn10[:9], start=1)) % 11
if tmp == 10:
return "X"
return tmp
def __str__(self) -> str:
return self.isbn10
class InternationalStandardSerialNumber(EuropeanArticleNumber13):
"""Initializes new ISSN barcode. This code is rendered as EAN-13
by prefixing it with 977 and adding 00 between code and checksum.
:parameters:
issn : String
The issn number as string.
writer : barcode.writer Instance
The writer to render the barcode (default: SVGWriter).
"""
name = "ISSN"
digits = 7
def __init__(self, issn, writer=None) -> None:
issn = issn.replace("-", "")
issn = issn[: self.digits]
self.issn = issn
self.issn = f"{issn}{self._calculate_checksum()}"
super().__init__(self.make_ean(), writer)
def _calculate_checksum(self):
tmp = (
11
- sum(x * int(y) for x, y in enumerate(reversed(self.issn[:7]), start=2))
% 11
)
if tmp == 10:
return "X"
return tmp
def make_ean(self):
return f"977{self.issn[:7]}00{self._calculate_checksum()}"
def __str__(self) -> str:
return self.issn
# Shortcuts
ISBN13 = InternationalStandardBookNumber13
ISBN10 = InternationalStandardBookNumber10
ISSN = InternationalStandardSerialNumber
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