[2017/03/31 18:59:15.834] ======================================================================
 [2017/03/31 18:59:15.835] ERROR: test_create_index (test.test_collection.TestCollection)
 [2017/03/31 18:59:15.835] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.835] Traceback (most recent call last):
 [2017/03/31 18:59:15.835]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 254, in test_create_index
 [2017/03/31 18:59:15.835]     with self.write_concern_collection() as coll:
 [2017/03/31 18:59:15.835]   File "/opt/python/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
 [2017/03/31 18:59:15.835]     return self.gen.next()
 [2017/03/31 18:59:15.835]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 131, in write_concern_collection
 [2017/03/31 18:59:15.835]     write_concern=WriteConcern(w=len(client_context.nodes) + 1))
 [2017/03/31 18:59:15.835] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.835] ======================================================================
 [2017/03/31 18:59:15.835] ERROR: test_create_indexes (test.test_collection.TestCollection)
 [2017/03/31 18:59:15.835] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.835] Traceback (most recent call last):
 [2017/03/31 18:59:15.835]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/__init__.py", line 324, in wrap
 [2017/03/31 18:59:15.835]     return f(*args, **kwargs)
 [2017/03/31 18:59:15.835]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 211, in test_create_indexes
 [2017/03/31 18:59:15.835]     with self.write_concern_collection() as coll:
 [2017/03/31 18:59:15.835]   File "/opt/python/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
 [2017/03/31 18:59:15.835]     return self.gen.next()
 [2017/03/31 18:59:15.835]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 131, in write_concern_collection
 [2017/03/31 18:59:15.835]     write_concern=WriteConcern(w=len(client_context.nodes) + 1))
 [2017/03/31 18:59:15.835] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.835] ======================================================================
 [2017/03/31 18:59:15.835] ERROR: test_drop_index (test.test_collection.TestCollection)
 [2017/03/31 18:59:15.835] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.835] Traceback (most recent call last):
 [2017/03/31 18:59:15.835]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 283, in test_drop_index
 [2017/03/31 18:59:15.835]     with self.write_concern_collection() as coll:
 [2017/03/31 18:59:15.835]   File "/opt/python/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
 [2017/03/31 18:59:15.835]     return self.gen.next()
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 131, in write_concern_collection
 [2017/03/31 18:59:15.836]     write_concern=WriteConcern(w=len(client_context.nodes) + 1))
 [2017/03/31 18:59:15.836] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.836] ======================================================================
 [2017/03/31 18:59:15.836] ERROR: test_map_reduce (test.test_collection.TestCollection)
 [2017/03/31 18:59:15.836] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.836] Traceback (most recent call last):
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 2051, in test_map_reduce
 [2017/03/31 18:59:15.836]     with self.write_concern_collection() as coll:
 [2017/03/31 18:59:15.836]   File "/opt/python/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
 [2017/03/31 18:59:15.836]     return self.gen.next()
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 131, in write_concern_collection
 [2017/03/31 18:59:15.836]     write_concern=WriteConcern(w=len(client_context.nodes) + 1))
 [2017/03/31 18:59:15.836] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.836] ======================================================================
 [2017/03/31 18:59:15.836] ERROR: test_reindex (test.test_collection.TestCollection)
 [2017/03/31 18:59:15.836] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.836] Traceback (most recent call last):
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 312, in test_reindex
 [2017/03/31 18:59:15.836]     with self.write_concern_collection() as coll:
 [2017/03/31 18:59:15.836]   File "/opt/python/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
 [2017/03/31 18:59:15.836]     return self.gen.next()
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 131, in write_concern_collection
 [2017/03/31 18:59:15.836]     write_concern=WriteConcern(w=len(client_context.nodes) + 1))
 [2017/03/31 18:59:15.836] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.836] ======================================================================
 [2017/03/31 18:59:15.836] ERROR: test_rename (test.test_collection.TestCollection)
 [2017/03/31 18:59:15.836] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.836] Traceback (most recent call last):
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 1784, in test_rename
 [2017/03/31 18:59:15.836]     with self.write_concern_collection() as coll:
 [2017/03/31 18:59:15.836]   File "/opt/python/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
 [2017/03/31 18:59:15.836]     return self.gen.next()
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_collection.py", line 131, in write_concern_collection
 [2017/03/31 18:59:15.836]     write_concern=WriteConcern(w=len(client_context.nodes) + 1))
 [2017/03/31 18:59:15.836] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.836] ======================================================================
 [2017/03/31 18:59:15.836] ERROR: test_drop_collection (test.test_database.TestDatabase)
 [2017/03/31 18:59:15.836] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.836] Traceback (most recent call last):
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_database.py", line 225, in test_drop_collection
 [2017/03/31 18:59:15.836]     write_concern=IMPOSSIBLE_WRITE_CONCERN)
 [2017/03/31 18:59:15.836] TypeError: __init__() got an unexpected keyword argument 'write_concern'
 [2017/03/31 18:59:15.836] ======================================================================
 [2017/03/31 18:59:15.836] ERROR: test_last_write_date (test.test_max_staleness.TestMaxStaleness)
 [2017/03/31 18:59:15.836] ----------------------------------------------------------------------
 [2017/03/31 18:59:15.836] Traceback (most recent call last):
 [2017/03/31 18:59:15.836]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/__init__.py", line 324, in wrap
 [2017/03/31 18:59:15.836]     return f(*args, **kwargs)
 [2017/03/31 18:59:15.837]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/__init__.py", line 324, in wrap
 [2017/03/31 18:59:15.837]     return f(*args, **kwargs)
 [2017/03/31 18:59:15.837]   File "/data/mci/a5834e50443aad0a7e942f156a86f8ca/src/.tox/synchro/tmp/mongo-python-driver/test/test_max_staleness.py", line 126, in test_last_write_date
 [2017/03/31 18:59:15.837]     server = client._topology.select_server(writable_server_selector)
 [2017/03/31 18:59:15.837]   File "synchro/__init__.py", line 317, in __getattr__
 [2017/03/31 18:59:15.837]     return Database(self, name, delegate=getattr(self.delegate, name))
 [2017/03/31 18:59:15.837]   File "motor/core.py", line 150, in __getattr__
 [2017/03/31 18:59:15.837]     self.__class__.__name__, name, name, name))
 [2017/03/31 18:59:15.837] AttributeError: MotorClient has no attribute '_topology'. To access the _topology database, use client['_topology'].