如何推入嵌套在字典中的数组？

Question

我想创建一个mongodb来存储作业结果,我创建了homework一个存储每个主题的结果数组的字典.

import pymongo

DBCONN = pymongo.Connection("127.0.0.1", 27017)
TASKSINFO = DBCONN.tasksinfo

_name = "john"
taskid = TASKSINFO.tasksinfo.insert(
    {"name": _name,
     "homework": {"bio": [], "math": []}
     })

TASKSINFO.tasksinfo.update({"_id": taskid},
                           {"$push": {"homework.bio", 92}})

当我试图将一些信息推送到db时,出现错误:

Traceback (most recent call last):
  File "mongo_push_demo.py", line 13, in <module>
    {"$push": {"homework.bio", 92}})
  File "/usr/local/lib/python2.7/dist-packages/pymongo-2.5-py2.7-linux-i686.egg/pymongo/collection.py", line 479, in update
    check_keys, self.__uuid_subtype), safe)
  File "/usr/local/lib/python2.7/dist-packages/pymongo-2.5-py2.7-linux-i686.egg/pymongo/message.py", line 110, in update
    encoded = bson.BSON.encode(doc, check_keys, uuid_subtype)
  File "/usr/local/lib/python2.7/dist-packages/pymongo-2.5-py2.7-linux-i686.egg/bson/__init__.py", line 567, in encode
    return cls(_dict_to_bson(document, check_keys, uuid_subtype))
  File "/usr/local/lib/python2.7/dist-packages/pymongo-2.5-py2.7-linux-i686.egg/bson/__init__.py", line 476, in _dict_to_bson
    elements.append(_element_to_bson(key, value, check_keys, uuid_subtype))
  File "/usr/local/lib/python2.7/dist-packages/pymongo-2.5-py2.7-linux-i686.egg/bson/__init__.py", line 466, in _element_to_bson
    type(value))
bson.errors.InvalidDocument: cannot convert value of type <type 'set'> to bson

Answer 1

{"$push": {"homework.bio", 92}})

它应该是:,而不是 ,.

{'a', 1} 是Python中的一组两个元素,这就是你得到错误的原因.