Pymongo聚合不返回游标而是返回对象

Question

我正在使用pymongo编写代码,它使用聚合框架将一些数据保存在其他集合中.代码是这样的:

from pymongo import MongoClient

def makeAggregate():
  print 'Making aggregation of commits..'

  commitsCollection = MongoClient("mongo-srv", 27017).gt.commits
  rankingCollection = MongoClient("mongo-srv", 27017).gt.commitsRanking

  pipe = [{'$unwind': '$commits'},{'$group':{"_id":"$_id", "picture": {"$first": "$picture"},'a':{'$sum':'$commits.a'},'d':{'$sum':'$commits.d'},'c':{'$sum':'$commits.c'}}}]
  cursor = commitsCollection.aggregate(pipeline=pipe)

  obj = next(cursor, None)
  while obj:
    rankingCollection.save(obj)
    obj = next(cursor, None)

makeAggregate()

代码在我的计算机上工作正常,但是当我将脚本移动到服务器时,脚本失败了,说:

Traceback (most recent call last):
  File "aggregate.py", line 17, in <module>
    makeAggregate()
  File "aggregate.py", line 12, in makeAggregate
    obj = next(cursor, None)
TypeError: dict object is not an iterator

该命令python --version返回

在我的电脑上: Python 2.7.3

在服务器上 Python 2.7.6

该命令pip show pymongo返回

在我的电脑上:

Usage: pip COMMAND [OPTIONS]
pip: error: No command by the name pip show
  (maybe you meant "pip install show")

(执行pip install show但在运行节目时一直这样说..)

在服务器上:

Name: pymongo
Version: 2.7
Location: /usr/local/lib/python2.7/dist-packages/pymongo-2.7-py2.7-linux-x86_64.egg
Requires:

pymongo.version在python中运行给了我:

在我的电脑中: 3.0

在服务器中 2.7

也许我必须更新这个？我怎样才能做到这一点？

Answer 1

是的,这就是问题,
不同版本的Pymongo用于开发和生产环境

在PyMongo 2.7中,它返回:Dictionary

{u'ok': 1.0, u'result': [{u'count': 3, u'_id': u'cat'}, {u'count': 2, u'_id': u'dog'}, {u'count': 1, u'_id': u'mouse'}]}

而在PyMongo 3.0中它返回:Cursor Object

{u'count': 3, u'_id': u'cat'}, {u'count': 2, u'_id': u'dog'}, {u'count': 1, u'_id': u'mouse'}

参考Pymongo 2.7文档
参考Pymongo 3.0文档
从PyMongo 2.7到PyMongo 3.0的更改

专业提示: 使用Python的虚拟环境并创建需求文本文件.因为您可以安装相同版本的Python库及其在本地开发和生产中的依赖关系.

请参阅虚拟环境Python包