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# -*- coding:utf-8 -*-
class UnknownHerdsError(ValueError):
def __init__(self, herd_names):
_plural = len(herd_names) != 1
super(UnknownHerdsError, self).__init__(
'Unknown %s %s' % (
_plural and 'herds' or 'herd',
','.join('"%s"' % e for e in herd_names)))
def check_metadata_herds(xml_tree, herd_base):
herd_nodes = xml_tree.findall('herd')
unknown_herds = [
name for name in (
e.text.strip() for e in herd_nodes if e.text is not None)
if not herd_base.known_herd(name)]
if unknown_herds:
raise UnknownHerdsError(unknown_herds)
def check_metadata(xml_tree, herd_base):
if herd_base is not None:
check_metadata_herds(xml_tree, herd_base)
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