Python pymongo应该有一个模块objectid吗？

短版

重新安装烧瓶和mongoalchemy后，两条管线：

from flask import Flask
from flask.ext.mongoalchemy import MongoAlchemy

失败原因：

ImportError: No module named objectid

我应该去哪里看

详细信息

在El Capitan之后：

> sudo port install py27-flask py27-flask-mongoalchemy

我确认MacPorts已安装的版本：

> port installed | grep 'flask\|mongo'
  py27-flask @0.10.1_1 (active)
  py27-flask-mongoalchemy @0.5.3_0 (active)
  py27-flask-script @2.0.5_0 (active)
  py27-mongoalchemy @0.11_0 (active)
  py27-pymongo @3.2.2_0 (active)

我正在运行MacPorts Python：

> which python
/opt/local/bin/python

这是2.7分支的最新版本：

> python --version
Python 2.7.11

但是第二页的第二行：

在以下情况下失败：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/flask/exthook.py", line 81, in load_module
    reraise(exc_type, exc_value, tb.tb_next)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/flaskext/mongoalchemy/__init__.py", line 14, in <module>
    from mongoalchemy import document, exceptions, fields, session, query
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mongoalchemy/document.py", line 45, in <module>
    from mongoalchemy.fields import ObjectIdField, Field, BadValueException, SCALAR_MODIFIERS
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mongoalchemy/fields.py", line 60, in <module>
    from pymongo.objectid import ObjectId
ImportError: No module named objectid

---

那没用。同样的错误也会弹出。

您有一个旧的mongoalchemy

请参阅提交“使用bson包而不是不推荐（然后删除）的pymongo包”：

也许你不应该信任python模块上的macports

编辑：

我发现macports不再维护该端口：

---

Pymongo不在所需的

bson

包中，也在包中导入。看起来您可能缺少一些导入。这是无论如何。您的安装可能有一些问题。您想澄清一下吗？该网站使用“from flask.ext.mongoalchemy import mongoalchemy”。它不使用bson。但是您是如何“安装”MongoAlchemy模块的？错误表明未安装所需的依赖项。

mongoalchemy

安装良好<代码>端口已安装| grep mongoalchemy报告

py27 flask mongoalchemy@0.5.3_0（活动）

和

py27 mongoalchemy@0.11_0（活动）

。我说“如何”而不是“如果”。同样，您似乎缺少必需的依赖项。无论如何，您确实不应该通过

端口安装，应该为您的项目使用“本地”安装并由包管理的python，而不是“系统”发行版。很好。甚至从2012年开始。如果您使用的是OS X，请推荐一种安装整套系统的方法。我刚刚安装了自制软件。我可以使用brew安装mongodb，但brew既不懂flask也不懂mongoalchemy。感谢您的帮助。virtualenv解决了这个问题。奇怪的是，virtualenv本身以及（AFAICT）所有模块都来自MacPorts，但只要它能工作，。。。
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/flask/exthook.py", line 81, in load_module
    reraise(exc_type, exc_value, tb.tb_next)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/flaskext/mongoalchemy/__init__.py", line 14, in <module>
    from mongoalchemy import document, exceptions, fields, session, query
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mongoalchemy/document.py", line 45, in <module>
    from mongoalchemy.fields import ObjectIdField, Field, BadValueException, SCALAR_MODIFIERS
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/mongoalchemy/fields.py", line 60, in <module>
    from pymongo.objectid import ObjectId
ImportError: No module named objectid

> port list | grep mongodb
mongodb                        @3.2.4          databases/mongodb
> sudo port install mongodb