self = <swh.storage.tests.storage_tests.TestStorage object at 0x7f111c236908> swh_storage = <swh.storage.postgresql.storage.Storage object at 0x7f10f85d1978> sample_data = <swh.storage.tests.storage_data.StorageData object at 0x7f10575c93c8> def test_person_fullname_unicity(self, swh_storage, sample_data): revision, rev2 = sample_data.revisions[0:2] # create a revision with same committer fullname but wo name and email revision2 = attr.evolve( rev2, committer=Person( > fullname=revision.committer.fullname, name=None, email=None ), ) .tox/py3/lib/python3.7/site-packages/swh/storage/tests/storage_tests.py:2834: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ inst = Revision(message=b'hello again', author=Person(fullname=b'Roberto Dicosmo <roberto@example.com>', name=b'Roberto Dicos...x1b,\xad\xda#zh\xad\xbb\x12',), id=b'\xa6F\xdd\x94\xc9\x12\x82\x96Y\xb2*\x1e~\x14=/\xa5\xeb\xde\x1b', extra_headers=()) changes = {'author': Person(fullname=b'Roberto Dicosmo <roberto@example.com>', name=b'Roberto Dicosmo', email=b'roberto@example....er': Person(fullname=b'St\xc3fano Zacchiroli <stefano@example.com>', name=None, email=None), 'message': b'hello again'} cls = <class 'swh.model.model.Revision'> attrs = (Attribute(name='message', default=NOTHING, validator=<function type_validator.<locals>._validator at 0x7f1218812510>,..., ...], converter=<function tuplify_extra_headers at 0x7f12187efae8>, kw_only=False, inherited=False, on_setattr=None)) a = Attribute(name='committer', default=NOTHING, validator=<function type_validator.<locals>._validator at 0x7f1218812620>...ppingproxy({}), type=<class 'swh.model.model.Person'>, converter=None, kw_only=False, inherited=False, on_setattr=None) attr_name = 'committer', init_name = 'committer' value = Person(fullname=b'tony <ar@dumont.fr>', name=b'tony', email=b'ar@dumont.fr') def evolve(inst, **changes): """ Create a new instance, based on *inst* with *changes* applied. :param inst: Instance of a class with ``attrs`` attributes. :param changes: Keyword changes in the new copy. Nested ``attrs`` classes can be updated by passing (nested) dicts of values. :return: A copy of inst with *changes* incorporated. :raise TypeError: If *attr_name* couldn't be found in the class ``__init__``. :raise attr.exceptions.NotAnAttrsClassError: If *cls* is not an ``attrs`` class. .. versionadded:: 17.1.0 """ cls = inst.__class__ attrs = fields(cls) for a in attrs: if not a.init: continue attr_name = a.name # To deal with private attributes. init_name = attr_name if attr_name[0] != "_" else attr_name[1:] value = getattr(inst, attr_name) if init_name not in changes: # Add original value to changes changes[init_name] = value elif has(value): # Evolve nested attrs classes > changes[init_name] = evolve(value, **changes[init_name]) E TypeError: evolve() argument after ** must be a mapping, not Person .tox/py3/lib/python3.7/site-packages/attr/_funcs.py:347: TypeError