title: Django won't start with a wierd error "AttributeError: 'module' object has no attribute 'getargspec'"
body: <p>I'm a bit inexperienced when it comes to Django's internals so I'm completely stuck now. It worked yesterday, and I can't remember I've changed anything significant.</p>
  
  <p>When I turn <code>DEBUG=True</code> there is a stack trace on any module which happens to be first in the list </p>
  
  <pre><code>Traceback (most recent call last):
        File "/home/yury/PycharmProjects/mezzamine/findmeals/mezzamine/manage.py", line 28, in &lt;module&gt;
          execute_from_command_line(sys.argv)
        File "/usr/local/lib/python3.4/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
          utility.execute()
        File "/usr/local/lib/python3.4/dist-packages/django/core/management/__init__.py", line 354, in execute
          django.setup()
        File "/usr/local/lib/python3.4/dist-packages/django/__init__.py", line 18, in setup
          from django.utils.log import configure_logging
        File "/usr/local/lib/python3.4/dist-packages/django/utils/log.py", line 13, in &lt;module&gt;
          from django.views.debug import ExceptionReporter, get_exception_reporter_filter
        File "/usr/local/lib/python3.4/dist-packages/django/views/debug.py", line 10, in &lt;module&gt;
          from django.http import (HttpResponse, HttpResponseServerError,
        File "/usr/local/lib/python3.4/dist-packages/django/http/__init__.py", line 4, in &lt;module&gt;
          from django.http.response import (
        File "/usr/local/lib/python3.4/dist-packages/django/http/response.py", line 13, in &lt;module&gt;
          from django.core.serializers.json import DjangoJSONEncoder
        File "/usr/local/lib/python3.4/dist-packages/django/core/serializers/__init__.py", line 23, in &lt;module&gt;
          from django.core.serializers.base import SerializerDoesNotExist
        File "/usr/local/lib/python3.4/dist-packages/django/core/serializers/base.py", line 6, in &lt;module&gt;
          from django.db import models
        File "/usr/local/lib/python3.4/dist-packages/django/db/__init__.py", line 98, in &lt;module&gt;
          signals.request_started.connect(reset_queries)
        File "/usr/local/lib/python3.4/dist-packages/django/dispatch/dispatcher.py", line 99, in connect
          argspec = inspect.getargspec(receiver)
      AttributeError: 'module' object has no attribute 'getargspec'
  </code></pre>
  
  <p>And when I turn <code>DEBUG=False</code> it complains about </p>
  
  <pre><code>Traceback (most recent call last):
        File "/home/yury/PycharmProjects/mezzamine/findmeals/mezzamine/manage.py", line 28, in &lt;module&gt;
          execute_from_command_line(sys.argv)
        File "/usr/local/lib/python3.4/dist-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
          utility.execute()
        File "/usr/local/lib/python3.4/dist-packages/django/core/management/__init__.py", line 354, in execute
          django.setup()
        File "/usr/local/lib/python3.4/dist-packages/django/__init__.py", line 18, in setup
          from django.utils.log import configure_logging
        File "/usr/local/lib/python3.4/dist-packages/django/utils/log.py", line 13, in &lt;module&gt;
          from django.views.debug import ExceptionReporter, get_exception_reporter_filter
        File "/usr/local/lib/python3.4/dist-packages/django/views/debug.py", line 10, in &lt;module&gt;
          from django.http import (HttpResponse, HttpResponseServerError,
        File "/usr/local/lib/python3.4/dist-packages/django/http/__init__.py", line 4, in &lt;module&gt;
          from django.http.response import (
        File "/usr/local/lib/python3.4/dist-packages/django/http/response.py", line 13, in &lt;module&gt;
          from django.core.serializers.json import DjangoJSONEncoder
        File "/usr/local/lib/python3.4/dist-packages/django/core/serializers/__init__.py", line 23, in &lt;module&gt;
          from django.core.serializers.base import SerializerDoesNotExist
        File "/usr/local/lib/python3.4/dist-packages/django/core/serializers/base.py", line 6, in &lt;module&gt;
          from django.db import models
        File "/usr/local/lib/python3.4/dist-packages/django/db/models/__init__.py", line 8, in &lt;module&gt;
          from django.db.models.manager import Manager  # NOQA
        File "/usr/local/lib/python3.4/dist-packages/django/db/models/manager.py", line 63, in &lt;module&gt;
          class BaseManager(six.with_metaclass(RenameManagerMethods)):
        File "/usr/local/lib/python3.4/dist-packages/django/utils/six.py", line 778, in __new__
          return meta(name, bases, d)
        File "/usr/local/lib/python3.4/dist-packages/django/utils/deprecation.py", line 50, in __new__
          for base in inspect.getmro(new_class):
      AttributeError: 'module' object has no attribute 'getmro'
  </code></pre>
  
  <p>I use Django 1.7.8 and Mezzanine 3 and tried upgrading and reinstalling them with no luck. Could anyone give a hint on what's wrong?</p>