如何修复"ImportError: No module named ..."错误

我有一个叫做django_trial_on_mac的Django应用程序，我最近搬到了GitHub，以便将来将它部署到heroku。我将项目克隆到mac上的本地GitHub文件夹，但当我从新目录运行应用程序时，我收到以下错误:

Traceback (most recent call last):    
  File     "/Users/danieloram/GitHub/Python_projects_for_github/django_trial_on_mac/manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages/django/core/management/__init__.py", line 338, in execute_from_command_line
    utility.execute()
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages/django/core/management/__init__.py", line 303, in execute
    settings.INSTALLED_APPS
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages/django/conf/__init__.py", line 48, in __getattr__
    self._setup(name)
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages/django/conf/__init__.py", line 44, in _setup
    self._wrapped = Settings(settings_module)
  File "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/site-packages/django/conf/__init__.py", line 92, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File     "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/importlib/__init__.py", line 124, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File     "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/importlib/_bootstrap.py", line 807, in _gcd_import
    _gcd_import(parent)
  File     "/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/importlib/_bootstrap.py", line 824, in _gcd_import
    raise ImportError(_ERR_MSG.format(name))
ImportError: No module named django_trial_on_mac

我还没有找到这个错误的具体情况的解决方案，我希望有人能解释或指向我对某个地方，我可以找到答案。谢谢!

问题原来是我有一个非标准的项目目录结构。我在我的'django_trial_on_mac'目录中缺少__init__.py文件。一旦我在那里创建了一个空的__init__.py文件，应用程序就正常运行了。

__init__.py文件告诉Django这个目录应该被当作一个包来对待，因为这个文件不存在于'django_trial_on_mac'目录中，所以它不能导入'django_trial_on_mac'模块。

没有更多信息很难回答，但看起来PYTHONPATH env变量在你的Heroku上有问题:

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