问ImportError:没有名为“ImportError”的模块

EN

(casenv) C:\pyprojects\focus\site>python manage.py runserver
Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "C:\virtualenvs\casenv\lib\site-packages\django\core\management\__init__.py", line 367, in execute_from_command_line
    utility.execute()
  File "C:\virtualenvs\casenv\lib\site-packages\django\core\management\__init__.py", line 341, in execute
    django.setup()
  File "C:\virtualenvs\casenv\lib\site-packages\django\__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "C:\virtualenvs\casenv\lib\site-packages\django\apps\registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "C:\virtualenvs\casenv\lib\site-packages\django\apps\config.py", line 199, in import_models
    self.models_module = import_module(models_module_name)
  File "C:\virtualenvs\casenv\lib\importlib\__init__.py", line 104, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2231, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2214, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2203, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1448, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "C:\pyprojects\focus\site\general\models.py", line 8, in <module>
    from focus2.util import HashedPk
  File "C:\pyprojects\focus\site\focus2\util.py", line 3, in <module>
    from settings import Hasher
ImportError: No module named 'settings'

#!/usr/bin/env python
import os
import sys

if __name__ == "__main__":
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "focus2.settings")
    try:
        from django.core.management import execute_from_command_line
    except ImportError:
        # The above import may fail for some other reason. Ensure that the
        # issue is really that Django is missing to avoid masking other
        # exceptions on Python 2.
        try:
            import django
        except ImportError:
            raise ImportError(
                "Couldn't import Django. Are you sure it's installed and "
                "available on your PYTHONPATH environment variable? Did you "
                "forget to activate a virtual environment?"
            )
        raise
    execute_from_command_line(sys.argv)

from django.utils.html import strip_tags, escape
from settings import Hasher

├───focus
│   ├───data_dumps
│   ├───notes
│   ├───setup
│   └───site(main project folder)
|       └───static
|       └───general
|       └───pro
|           └───models
|               +--__init__.py
|               +--plans.py
│       └───focus2
│           └───templates
|           +--__init__.py
│           +--settings.py
│           +--util.py            
│           +--wsgi.py
│       +--manage.py

(casenv) C:\virtualenvs\casenv>pip freeze
certifi==2017.7.27.1
chardet==3.0.4
defusedxml==0.5.0
Django==1.10.1
django-ajax-selects==1.5.0
django-allauth==0.32.0
django-crispy-forms==1.6.1
easy-thumbnails==2.3
hashids==1.1.0
idna==2.5
lxml==3.7.3
mysqlclient==1.3.10
oauthlib==2.0.2
Pillow==3.3.1
PyMySQL==0.7.11
python3-openid==3.1.0
requests==2.18.3
requests-oauthlib==0.8.0
urllib3==1.22

(testvenv27) C:\virtualenvs\testvenv27>pip freeze
Django==1.10.1
django-ajax-selects==1.5.0
django-allauth==0.27.0
django-crispy-forms==1.6.0
easy-thumbnails==2.3
hashids==1.1.0
lxml==3.4.2
MySQL-python==1.2.5
oauthlib==2.0.0
Pillow==3.3.1
python-openid==2.2.5
requests==2.9.1
requests-oauthlib==0.6.1

>>> import sys
>>> print(sys.path)
['', 'C:\\WINDOWS\\SYSTEM32\\python34.zip', 'C:\\virtualenvs\\casenv\\DLLs', 'C:\\virtualenvs\\casenv\\lib', 'C:\\virtualenvs\\casenv\\Scripts', 'c:\\python34\\Lib', 'c:\\python34\\DLLs', 'C:\\virtualenvs\\casenv', 'C:\\virtualenvs\\casenv\\lib\\site-packages']