GeezerVison is showing github.com — python-stdnum/update/isbn.py at master · unho/python-stdnum

Expand file tree

isbn.py

Copy path

More file actions

Latest commit

History

executable file

84 lines (69 loc) · 2.93 KB

isbn.py

Copy path

File metadata and controls

executable file

84 lines (69 loc) · 2.93 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

#!/usr/bin/env python3

# update/isbn.py - script to get ISBN prefix data

# This library is free software; you can redistribute it and/or

# modify it under the terms of the GNU Lesser General Public

# License as published by the Free Software Foundation; either

# version 2.1 of the License, or (at your option) any later version.

# This library is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public

# License along with this library; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301 USA

"""This script downloads XML data from the International ISBN Agency

website and provides a compact form of all group prefixes, and registrant

ranges for those prefixes suitable for the numdb module. This data is needed

to correctly split ISBNs into an EAN.UCC prefix, a group prefix, a registrant,

an item number and a check-digit."""

import lxml.etree

import requests

# the location of the ISBN Ranges XML file

download_url = 'https://www.isbn-international.org/export_rangemessage.xml'

def ranges(group):

"""Provide the ranges for the group."""

for rule in group.findall('./Rules/Rule'):

length = int(rule.find('./Length').text.strip())

if length:

yield '-'.join(

x[:length]

for x in rule.find('./Range').text.strip().split('-'))

def wrap(text):

"""Rewrap the provided text into lines."""

while text:

i = len(text)

if i > 73:

i = text.rindex(',', 20, 73)

yield text[:i]

text = text[i + 1:]

if __name__ == '__main__':

print('# generated from RangeMessage.xml, downloaded from')

print('# %s' % download_url)

response = requests.get(download_url, timeout=30)

response.raise_for_status()

# parse XML document

document = lxml.etree.fromstring(response.content)

# dump data from document

print('# file serial %s' % document.find('./MessageSerialNumber').text.strip())

print('# file date %s' % document.find('./MessageDate').text.strip())

top_groups = dict(

(x.find('./Prefix').text.strip(), x)

for x in document.findall('./EAN.UCCPrefixes/EAN.UCC'))

prevtop = None

for group in document.findall('./RegistrationGroups/Group'):

top, prefix = group.find('./Prefix').text.strip().split('-')

agency = group.find('./Agency').text.strip()

if top != prevtop:

print(top)

for line in wrap(','.join(ranges(top_groups[top]))):

print(' %s' % line)

prevtop = top

print(' %s agency="%s"' % (prefix, agency))

for line in wrap(','.join(ranges(group))):

print(' %s' % line)