Django 1.1.2＆amp; Python 2.6.5
执行看似无辜的查询集时，我不断收到此错误。看起来与http://code.djangoproject.com/ticket/7204中描述的问题完全相同。但是，我正在运行Django 1.1.2，它本应该修复此错误。以前有人处理过类似的事吗？
以下是构造查询的代码：
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
这是一个删节版本（非常有用）：
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
答案 0 :(得分：1)
为了使其他人可能遇到此问题，错误是由使用django-multilingual和django.db的F对象组合引起的。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中的一个错误，有关详细信息，请参阅http://bugs.python.org/issue1515