错误为：没有名为Django_mongodb_engine.bas的模块

Question

我这样安装和配置了Django/MongoDB！

pip install virtualenv

source myproject/bin/activate

pip install hg+https://bitbucket.org/wkornewald/django-nonrel

pip install hg+https://bitbucket.org/wkornewald/djangotoolbox

pip install git+https://github.com/django-nonrel/mongodb-engine

所有这些行动都是成功的！

现在，当我这样更改settings.py文件时：

DATABASES = {
    'default': {
        'ENGINE': 'django_mongodb_engine', # Add 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
        'NAME': 'mong_db',                      # Or path to database file if using sqlite3.
        'USER': '',                      # Not used with sqlite3.
        'PASSWORD': '',                  # Not used with sqlite3.
        'HOST': '',                      # Set to empty string for localhost. Not used with sqlite3.
        'PORT': '',                      # Set to empty string for default. Not used with sqlite3.
    }

出现弯曲思维错误：

Error was: No module named django_mongodb_engine.base

显然django_mongodb_引擎安装成功了。但为什么会出现这个错误呢？

顺便说一句，原谅我英语不好！

Answer 1

我经历了与您相同的步骤，然后打开了一个Python shell：

$ python
>>> import django_mongodb_engine.base
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/emptysquare/.virtualenvs/foo/lib/python2.7/site-packages/django_mongodb_engine/base.py", line 4, in <module>
    from django.db.backends.signals import connection_created
  File "/Users/emptysquare/.virtualenvs/foo/lib/python2.7/site-packages/django/db/__init__.py", line 14, in <module>
    if not settings.DATABASES:
  File "/Users/emptysquare/.virtualenvs/foo/lib/python2.7/site-packages/django/utils/functional.py", line 276, in __getattr__
    self._setup()
  File "/Users/emptysquare/.virtualenvs/foo/lib/python2.7/site-packages/django/conf/__init__.py", line 40, in _setup
    raise ImportError("Settings cannot be imported, because environment variable %s is undefined." % ENVIRONMENT_VARIABLE)
ImportError: Settings cannot be imported, because environment variable DJANGO_SETTINGS_MODULE is undefined.

但如果我这样做了：

$ DJANGO_SETTINGS_MODULE=settings python
>>> import django_mongodb_engine.base

。。。它起作用了。

可以设置DJANGO_SETTINGS_模块并尝试在Python shell中导入DJANGO_mongodb_engine.base吗？