为什么Python找不到我安装的django-lockdown模块？

Question

我有一个Django应用程序，它出问题了，因为找不到我已经安装的一个模块，叫做Django-Lockdown。有人能告诉我怎么解决这个问题吗？

第一步：启动虚拟环境，确保这个模块已经安装：

$ source /opt/virtualEnvs/myApp/bin/activate


(myApp)$ pip -r requirements.txt
<SNIPPED>

(myApp)$ pip show django-lockdown
---
Name: django-lockdown
Version: 1.0
Location: /opt/virtualEnvs/jobBidSite/lib/python2.7/site-packages/django_lockdown-1.0-py2.7.egg
Requires:

第二步：运行Python命令行，手动导入这个模块。这样是可以的。

(myApp)$ python
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import lockdown
>>> exit()

第三步：启动开发服务器。结果失败了，因为它说找不到这个模块。为什么会这样呢？

(myApp)$ sudo python ./manage.py runserver 0.0.0.0:80
Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 280, in execute
    translation.activate('en-us')
  File "/usr/local/lib/python2.7/dist-packages/django/utils/translation/__init__.py", line 130, in activate
    return _trans.activate(language)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/translation/trans_real.py", line 188, in activate
    _active.value = translation(language)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/translation/trans_real.py", line 177, in translation
    default_translation = _fetch(settings.LANGUAGE_CODE)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/translation/trans_real.py", line 159, in _fetch
    app = import_module(appname)
  File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py", line 40, in import_module
    __import__(name)
ImportError: No module named lockdown

django 错误处理模块导入开发服务器虚拟环境应用程序调试

为什么Python找不到我安装的django-lockdown模块？

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