geodjango中的“无法导入名称多边形”

我正在尝试按照这个简单的教程在网页的传单上显示标记。但是，出现以下错误：

从django.contrib.gis.geos.geometry导入Polygon ImportError：无法导入名称Polygon

由于from djgeojson.views import GeoJSONLayerView我的这一陈述urls.py

我不确定如何解决此问题，我已经为geodjango安装了所有必需的依赖项，并且找不到名为“ Polygon”的软件包。

这是完整的错误：

Unhandled exception in thread started by <function wrapper at 0x7fbe7c083050>
Traceback (most recent call last):
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/utils/autoreload.py", line 226, in wrapper
    fn(*args, **kwargs)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 116, in inner_run
    self.check(display_num_errors=True)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/management/base.py", line 426, in check
    include_deployment_checks=include_deployment_checks,
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/checks/registry.py", line 75, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/checks/urls.py", line 10, in check_url_config
    return check_resolver(resolver)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/checks/urls.py", line 19, in check_resolver
    for pattern in resolver.url_patterns:
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/utils/functional.py", line 33, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 417, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/utils/functional.py", line 33, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 410, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/mohamed/Dropbox/newsparse/newsparser/src/newsparser/urls.py", line 22, in <module>
    url(r'^', include('textnews.urls')),
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/django/conf/urls/__init__.py", line 52, in include
    urlconf_module = import_module(urlconf_module)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/home/mohamed/Dropbox/newsparse/newsparser/src/textnews/urls.py", line 19, in <module>
    from djgeojson.views import GeoJSONLayerView
  File "/home/mohamed/Dropbox/newsparse/newsparser/local/lib/python2.7/site-packages/djgeojson/views.py", line 6, in <module>
    from django.contrib.gis.geos.geometry import Polygon
ImportError: cannot import name Polygon