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