[rset] New method: ResultSet.one()
This method will return exactly one entity while enforcing its existence and unicity.
The idea is shamelessly borowed from SQLAlchemy Query.one().
Closes #3352314
[jcr: use len(self) instead of len(self.rows)]
from StringIO import StringIO
from logilab.common.testlib import TestCase, unittest_main
from cubicweb import dataimport
class UcsvreaderTC(TestCase):
def test_empty_lines_skipped(self):
stream = StringIO('''a,b,c,d,
1,2,3,4,
,,,,
,,,,
''')
self.assertEqual([[u'a', u'b', u'c', u'd', u''],
[u'1', u'2', u'3', u'4', u''],
],
list(dataimport.ucsvreader(stream)))
stream.seek(0)
self.assertEqual([[u'a', u'b', u'c', u'd', u''],
[u'1', u'2', u'3', u'4', u''],
[u'', u'', u'', u'', u''],
[u'', u'', u'', u'', u'']
],
list(dataimport.ucsvreader(stream, skip_empty=False)))
if __name__ == '__main__':
unittest_main()