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嗨，我正在使用 Mac OS (SnowLeopard)。我默认安装了python，我猜是2.6。我从 python 服务器安装了 python 3.3，现在也安装了 django。我使用 STARTPROJECT 创建了一个 django 项目，并尝试使用 manage.py runserver 运行它。

我收到错误，但从错误中可以看出使用的 python 仍然是 2.6 如何更改？

错误是

Unhandled exception in thread started by <bound method Command.inner_run of <django.contrib.staticfiles.management.commands.runserver.Command object at 0x10169aed0>>
Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/django/core/management/commands/runserver.py", line 92, in inner_run
    self.validate(display_num_errors=True)
  File "/Library/Python/2.6/site-packages/django/core/management/base.py", line 280, in validate
    num_errors = get_validation_errors(s, app)
  File "/Library/Python/2.6/site-packages/django/core/management/validation.py", line 35, in get_validation_errors
    for (app_name, error) in get_app_errors().items():
  File "/Library/Python/2.6/site-packages/django/db/models/loading.py", line 166, in get_app_errors
    self._populate()
  File "/Library/Python/2.6/site-packages/django/db/models/loading.py", line 72, in _populate
    self.load_app(app_name, True)
  File "/Library/Python/2.6/site-packages/django/db/models/loading.py", line 96, in load_app
    models = import_module('.models', app_name)
  File "/Library/Python/2.6/site-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/Library/Python/2.6/site-packages/django/contrib/auth/models.py", line 21, in <module>
    from django.contrib.contenttypes.models import ContentType
  File "/Library/Python/2.6/site-packages/django/contrib/contenttypes/models.py", line 127, in <module>
    class ContentType(models.Model):
  File "/Library/Python/2.6/site-packages/django/db/models/base.py", line 97, in __new__
    new_class.add_to_class('_meta', Options(meta, **kwargs))
TypeError: Error when calling the metaclass bases
    __init__() keywords must be strings
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