Django RuntimeError：超出最大递归深度答案

【问题标题】：Django RuntimeError: maximum recursion depth exceededDjango RuntimeError：超出最大递归深度
【发布时间】：2013-02-20 14:34:03
【问题描述】：

我是 Django 新手。我使用easy_install（在Mac上）和用于eclipse的PyDev Django插件安装了Django。我按照标准程序创建了一个新的 PyDev Django 项目。当我尝试将项目作为 PyDev: Django 运行时，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，但是没有用。

sys.setrecursionlimit(2000)

这是部分堆栈跟踪。

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？

【问题讨论】：

你确定你的模型没有相互引用或者是什么奇怪的东西吗？
它只是一个空项目，结构和内容与Django官网中指定的相同。
能否请您发布堆栈跟踪？
@andrefsp 我刚刚用堆栈跟踪更新了我的问题。
@Ashwin 你的模型看起来确实有问题。我相信您正在使用 Django 自定义用户模型。正确的？回溯并没有说太多，但我会尝试查看身份验证模型导入。您可能已经引用了一些自定义身份验证模型并再次将其导入某个地方。

标签： python django eclipse pydev

【解决方案1】：

问题出在 functools.py 文件中。该文件来自 Python。

要解决这个问题，请替换这个（关于 python\Lib\fuctools.py 中的第 56 行）：

    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)]
}

到那个：

    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)]
}

另请阅读：http://regebro.wordpress.com/2010/12/13/python-implementing-rich-comparison-the-correct-way/

【讨论】：

这解决了 Windows 10 上的问题，编辑文件 C:\Python27\Lib\functools.py
这确实是有用的答案并解决了我的问题，但是您是如何找到错误原因的

【解决方案2】：

我删除了 PyDev、Django 和 Python 并重新安装了所有这些，现在它可以工作了。谢谢！

【讨论】：

【解决方案3】：

我在 python 2.7.1 中使用pyenv virtualenvs 时遇到过几次。我不想编辑核心文件，所以我升级到 2.7.5 并且它运行完美。希望这是你们中的一些人的选择。

【讨论】：