python - 类型错误 : instancemethod expected at least 2 arguments, 得到 0

Question

Django 1.1.2 & Python 2.6.5

在执行看似无害的查询集时，我不断收到此错误。看起来与 http://code.djangoproject.com/ticket/7204 中描述的问题完全一样但是，我正在运行 Django 1.1.2，它应该修复了这个错误。有没有人处理过类似的事情？

下面是构造查询的代码:

def get_some_data(self, start_date, end_date):
    qset = Transaction.txn_objects.get_transactions_between(self.business,
                                                            start_date, 
                                                            end_date)
    income_qset = qset.filter(invoiceitem__invoice__customer = self)
    income_qset = income_qset.exclude(
                    account=F("invoiceitem__taxtypes__account_payable"))
    sums = income_qset.aggregate(models.Sum('credit_amount')) # fails here

这是回溯的简化版本(不是很有用):

File ".../models.py" in get_income_between
  200.         sums = income_qset.aggregate(models.Sum('credit_amount'))
File ".../lib/python2.6/site-packages/django/db/models/query.py" in aggregate
  274.         query = self.query.clone()
File ".../lib/python2.6/site-packages/django/db/models/sql/query.py" in clone
  201.         obj.where = deepcopy(self.where, memo=memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  173.                 y = copier(memo)
File ".../lib/python2.6/site-packages/django/utils/tree.py" in __deepcopy__
  61.         obj.children = deepcopy(self.children, memodict)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_list
  228.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  173.                 y = copier(memo)
File ".../lib/python2.6/site-packages/django/utils/tree.py" in __deepcopy__
  61.         obj.children = deepcopy(self.children, memodict)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_list
  228.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  173.                 y = copier(memo)
File ".../lib/python2.6/site-packages/django/utils/tree.py" in __deepcopy__
  61.         obj.children = deepcopy(self.children, memodict)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_list
  228.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  173.                 y = copier(memo)
File ".../lib/python2.6/site-packages/django/utils/tree.py" in __deepcopy__
  61.         obj.children = deepcopy(self.children, memodict)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_list
  228.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_tuple
  235.         y.append(deepcopy(a, memo))
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  338.             state = deepcopy(state, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  162.         y = copier(x, memo)
File "/usr/lib/python2.6/copy.py" in _deepcopy_dict
  255.         y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/python2.6/copy.py" in deepcopy
  189.                 y = _reconstruct(x, rv, 1, memo)
File "/usr/lib/python2.6/copy.py" in _reconstruct
  323.     y = callable(*args)
File "/usr/lib/python2.6/copy_reg.py" in __newobj__
  93.     return cls.__new__(cls, *args)

Exception Type: TypeError at /reports/income_expense/by_customer/32/
Exception Value: instancemethod expected at least 2 arguments, got 0

Answer 1

为了其他可能遇到此问题的人的利益，错误是由使用 django-multilingual 和 django.db 的 F 对象的组合引起的。重写代码以消除 F 对象解决了这个问题。

根本原因实际上是 Python 中的错误，有关详细信息，请参阅 http://bugs.python.org/issue1515