pymongo数据库的insert（）和insert_one（）方法均不能调用“集合”对象

在pymongo这里遇到了一个真正的障碍性错误，这使我无法继续进行项目。我已经搜索过此案例，但其他类似的帖子及其答案对我却不起作用。

首先，我正在运行：

mongod v3.6.5-2-g9b2264cf14    
MongoDB shell version v3.6.5-2-g9b2264cf14

这是我的最小工作/错误产生示例：

myname@myhost ~ $ /usr/bin/python
Python 2.7.12 (default, Dec  4 2017, 14:50:18)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymongo
>>> db = pymongo.MongoClient("localhost:27017")
>>> db.testcollection.insert({"foo": "bar"})
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python2.7/dist-packages/pymongo/collection.py", line 2344, in __call__
    self.__name)
TypeError: 'Collection' object is not callable. If you meant to call the 'insert' method on a 'Database' object it is failing because no such method exists.
>>>

建议使用其他StackOverflow主题insert_one()代替。但是，这为我产生了相同的结果：

myname@myhost ~ $ /usr/bin/python
Python 2.7.12 (default, Dec  4 2017, 14:50:18)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymongo
>>> db = pymongo.MongoClient("localhost:27017")
>>> db.testcollection.insert_one({"foo": "bar"})
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/lib/python2.7/dist-packages/pymongo/collection.py", line 2344, in __call__
    self.__name)
TypeError: 'Collection' object is not callable. If you meant to call the 'insert_one' method on a 'Database' object it is failing because no such method exists.

任何帮助表示赞赏！

您尚未选择数据库。“ db”对象是MongoClient对象。您需要获取一个数据库对象。

尝试这个：

db[][].insert();