Django 运行时错误: 最大递归深度超过限制

Question

我是Django的新手。我在Mac上使用easy_install安装了Django和PyDev Django插件。我按照标准程序创建了一个新的PyDev Django项目。当我尝试以PyDev: Django的形式运行该项目时，出现以下错误。

Validating models...

RuntimeError: maximum recursion depth exceeded

我也尝试在manage.py中添加以下行，但没有用。

sys.setrecursionlimit(2000)

这里是部分堆栈跟踪信息。

Unhandled exception in thread started by <bound method Command.inner_run of    <django.contrib.staticfiles.management.commands.runserver.Command object at 0x10e2*****>>
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/core/management/commands/runserver.py", line 92, in inner_run
self.validate(display_num_errors=True)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/core/management/base.py", line 280, in validate
num_errors = get_validation_errors(s, app)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/core/management/validation.py", line 35, in get_validation_errors
for (app_name, error) in get_app_errors().items():
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/loading.py", line 166, in get_app_errors
self._populate()
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/loading.py", line 72, in _populate
self.load_app(app_name, True)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/loading.py", line 96, in load_app
models = import_module('.models', app_name)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/utils/importlib.py", line 35, in import_module
__import__(name)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/contrib/auth/models.py", line 370, in <module>
class AbstractUser(AbstractBaseUser, PermissionsMixin):
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/base.py", line 213, in __new__
new_class.add_to_class(field.name, copy.deepcopy(field))
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/base.py", line 265, in add_to_class
value.contribute_to_class(cls, name)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/fields/__init__.py", line 257, in contribute_to_class
cls._meta.add_field(self)
File "/Library/Python/2.7/site-packages/Django-1.5-py2.7.egg/django/db/models/options.py", line 179, in add_field
self.local_fields.insert(bisect(self.local_fields, field), field)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/functools.py", line 56, in <lambda>
'__lt__': [('__gt__', lambda self, other: other < self),
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/functools.py", line 56, in <lambda>
'__lt__': [('__gt__', lambda self, other: other < self),
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/functools.py", line 56, in <lambda>
'__lt__': [('__gt__', lambda self, other: other < self),
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/functools.py", line 56, in <lambda>
'__lt__': [('__gt__', lambda self, other: other < self),

我做错了什么？

- Ashwin

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你确定你的模型没有相互引用或其他奇怪的东西吗？ - GordonsBeard

这只是一个空项目，具有与 Django 的官方网站上规定的相同结构和内容。 - Ashwin

请问您能否提供堆栈跟踪信息？ - andrefsp

@Ashwin，看起来是模型出了问题。我猜你正在使用Django自定义用户模型。对吗？ 溯源并没有太多的信息，但我建议你查看一下授权模型导入的周围。 你可能引用了某些自定义的授权模型，并在其他地方再次导入它。 - andrefsp

Django Python中的manage.py runserver命令出现RuntimeError: maximum recursion depth exceeded错误。 - user9876

Answer 1

问题出现在functools.py文件中，该文件来自Python。

要解决这个问题，请替换此处（位于python\Lib\fuctools.py的第56行左右）：

    convert = {
    '__lt__': [('__gt__', lambda self, other: other < self),
               ('__le__', lambda self, other: not other < self),
               ('__ge__', lambda self, other: not self < other)],
    '__le__': [('__ge__', lambda self, other: other <= self),
               ('__lt__', lambda self, other: not other <= self),
               ('__gt__', lambda self, other: not self <= other)],
    '__gt__': [('__lt__', lambda self, other: other > self),
               ('__ge__', lambda self, other: not other > self),
               ('__le__', lambda self, other: not self > other)],
    '__ge__': [('__le__', lambda self, other: other >= self),
               ('__gt__', lambda self, other: not other >= self),
               ('__lt__', lambda self, other: not self >= other)]
}

到那：

    convert = {
    '__lt__': [('__gt__', lambda self, other: not (self < other or self == other)),
               ('__le__', lambda self, other: self < other or self == other),
               ('__ge__', lambda self, other: not self < other)],
    '__le__': [('__ge__', lambda self, other: not self <= other or self == other),
               ('__lt__', lambda self, other: self <= other and not self == other),
               ('__gt__', lambda self, other: not self <= other)],
    '__gt__': [('__lt__', lambda self, other: not (self > other or self == other)),
               ('__ge__', lambda self, other: self > other or self == other),
               ('__le__', lambda self, other: not self > other)],
    '__ge__': [('__le__', lambda self, other: (not self >= other) or self == other),
               ('__gt__', lambda self, other: self >= other and not self == other),
               ('__lt__', lambda self, other: not self >= other)]
}

阅读这篇文章：http://regebro.wordpress.com/2010/12/13/python-implementing-rich-comparison-the-correct-way/

- tstempko

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这个解决了在Windows 10上的问题，编辑文件C:\Python27\Lib\functools.py。 - Daniel Neel

这个答案非常有用并解决了我的问题，但你是如何找到错误原因的呢？ - Harun ERGUL

Answer 2

我在使用 pyenv virtualenvs 和 Python 2.7.1 时遇到过几次这个问题。我不想编辑核心文件，所以我升级到了 2.7.5，并且它完美地解决了这个问题。希望这对你们中的一些人来说是一个选项。

- Jerad

Answer 3

我卸载了PyDev、Django和Python，然后重新安装它们，现在它可以正常工作了。谢谢！

- Ashwin