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django models recursive imports - how to resolve

from django.db import models

    from django.utils import simplejson

    from core.models import pmo_review_task

       

from django.db import models

from datetime import datetime

from django.contrib.auth.models import User

from core.models import sc_review_task

       

from django.db import models

from core.models import project_phase

       

Unhandled exception in thread started by <bound method Command.inner_run of <django.core.management.commands.runserver.Command object at 0x010ACFB0>>

Traceback (most recent call last):

  File "C:Python27libsite-packagesdjangocoremanagementcommandsrunserver.py", line 88, in inner_run

    self.validate(display_num_errors=True)

  File "C:Python27libsite-packagesdjangocoremanagementbase.py", line 249, in validate

    num_errors = get_validation_errors(s, app)

  File "C:Python27libsite-packagesdjangocoremanagementvalidation.py", line 35, in get_validation_errors

    for (app_name, error) in get_app_errors().items():

  File "C:Python27libsite-packagesdjangodbmodelsloading.py", line 146, in get_app_errors

    self._populate()

  File "C:Python27libsite-packagesdjangodbmodelsloading.py", line 64, in _populate

    self.load_app(app_name)

  File "C:Python27libsite-packagesdjangodbmodelsloading.py", line 78, in load_app

    models = import_module('.models', app_name)

  File "C:Python27libsite-packagesdjangoutilsimportlib.py", line 35, in import_module

    __import__(name)

  File "C:workPortmancoremodels__init__.py", line 4, in <module>

    from pmo_review_task import pmo_review_task

  File "C:workPortmancoremodelspmo_review_task.py", line 5, in <module>

    from core.models import sc_review_task

  File "C:workPortmancoremodelssc_review_task.py", line 3, in <module>

    from core.models import project_phase

  File "C:workPortmancoremodelsproject_phase.py", line 4, in <module>

    from core.models import pmo_review_task

ImportError: cannot import name pmo_review_task

       

project_phase = get_model('core', 'project_phase')

       

import foo # executed upon importing this file.

 

def import_foo_when_called():

    import foo # only executed when function is called, thus no problems when

               # another module imports this file.