错误：“字典更新序列元素＃0具有长度1; 2是必需的“在Django 1.4上 [英] Error: "dictionary update sequence element #0 has length 1; 2 is required" on Django 1.4
本文介绍了错误：“字典更新序列元素＃0具有长度1; 2是必需的“在Django 1.4上的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在django 1.4上有一个错误消息：
字典更新序列元素＃0的长度为1; 2需要
使用模板标签，如：`{％for v in values％}：
字典更新序列元素＃0的长度为1; 2需要
请求方法：GET
请求URL：...
Django版本：1.4.5
异常类型：ValueError
异常值：
字典更新序列元素＃0的长度为1;需要$ 2
异常位置：__init__中的/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py第21行
Python可执行文件：/ usr / bin / uwsgi-core
Python版本：2.7.3
Python路径：
['/ var / www /'，
'。'，
''，
'/usr/lib/python2.7'，
'/usr/lib/python2.7/plat-linux2'，
'/usr/lib/python2.7 / lib-tk'，
'/usr/lib/python2.7/lib-old'，
'/usr/lib/python2.7/lib-dynload'，
'/ usr / local / lib / python2.7 / dist-packages'，
'/usr/lib/python2.7/dist-packages'，
'/usr/lib/python2.7/dist-软件包/ PIL'，
'/usr/lib/pymodules/python2.7']
服务器时间：sam，2013年7月13日16:15:45 +0200
错误在模板渲染中
在模板/var/www/templates/app/index.html中，第172行错误
字典更新序列元素＃0的长度为1; 2需要
172 {％产品中的产品％}
追溯切换到复制和粘贴视图
/ usr / lib / python2.7 / dist-packages / django / core / handlers / base.py in get_response
response = callback（request，* callback_args，** callback_kwargs）
..
▶本地vars
/usr/lib/python2.7/dist-packages/django/contrib/auth/decorators.py在_wrapped_view
return view_func（request，* args，** kwargs）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/views/decorators/http.py在内部
返回func（请求，* args，** kwargs）
...
▶本地vars
./app/views。 py in index
context_instance = RequestContext（request））
...
▶本地vars
/usr/lib/python2.7/dist -packages / django / shortcuts / __ init__.py in render_to_response
return HttpResponse（loader.re nder_to_string（* args，** kwargs），** httpresponse_kwargs）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django /template/loader.py in render_to_string
return t.render（context_instance）
...
▶本地vars
/ usr / lib / python2.7 / dist-packages / django / template / base.py在render
return self._render（context）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/template/base.py在_render
返回self.nodelist.render（上下文）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/template/base.py在render
bit = self.render_node （节点，上下文）
...
▶render_node中的本地vars
/usr/lib/python2.7/dist-packages/django/template/debug.py b
$ b返回node.render（上下文）
...
▶本地vars
/usr/lib/python2.7/dist-packa ges / django / template / loader_tags.py在render
返回compiled_parent._render（上下文）
...
▶本地vars
/ usr /lib/python2.7/dist-packages/django/template/base.py在_render
返回self.nodelist.render（上下文）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/template/base.py在render
bit = self.render_node（node，context）
...
▶render_node中的本地vars
/usr/lib/python2.7/dist-packages/django/template/debug.py
return node.render（context）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/template/loader_tags.py在渲染
result = block.nodelist.render（上下文）
...
▶本地vars
/usr/lib/python2.7 /dist-packages/django/template/base.py在render
bit = self.render_node（node，context）
...
▶render_node中的本地vars
/usr/lib/python2.7/dist-packages/django/template/debug.py
返回node.render（上下文）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/template/defaulttags.py在渲染
len_values = len（values）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django /core/paginator.py __len__
return len（self.object_list）
...
▶本地vars
/ usr / lib / python2.7 / dist-packages / django / db / models / query.py in __len__
self._result_cache = list（self.iterator（））
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/db/models/query.py在迭代器
obj = model（* row [ index_start：aggregate_start]）
...
▶本地vars
/usr/lib/python2.7/dist-packages/django/db/models/base.py __init__
setattr（self，field.attname，val）
...
▶本地vars
/usr/local/lib/python2.7/ dist-packages / djorm_hstore / fields.py __set__
value = self.field._attribute_class（value，self.field，obj）
...
▶local vars
/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __init__
super（HStoreDictionary，self）.__ init __（value，** params）
...
▶本地vars
它当我尝试访问hstore查询器时也会发生：
追溯（最近的最后一次呼叫）：
文件manage.py，第14行在< module>
execute_manager（settings）
文件/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py，第459行，在execute_manager
utility.execute（）
文件/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py，第382行，执行
self.fetch_command（子命令）.run_from_argv（self.argv）
文件/usr/local/lib/python2.7/dist-packages/django/core/management/base.py ，第196行，在run_from_argv
self.execute（* args，** options .__ dict__）
文件/usr/local/lib/python2.7/dist-packages/django /core/management/base.py，第232行，执行
output = self.handle（* args，** options）
文件/ home / name / workspace / project /app/data/commands/my_command.py，第60行，句柄
item_id = tmp [0] .id，
文件/usr/local/lib/python2.7 /dist-packages/django/db/models/query.py，第207行，__getitem__
返回列表（qs）[0]
文件/ usr / local / lib / python2.7 / DIST - 对ackages / django / db / models / query.py，第87行，__len__
self._result_cache.extend（self._iter）
文件/ usr / local / lib / python2 .7 / dist-packages / django / db / models / query.py，第301行，迭代器
obj = model（* row [index_start：aggregate_start]）
文件/ usr / local / lib / python2.7 / dist-packages / django / db / models / base.py，第300行，__init__
setattr（self，field.attname，val）
文件/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py，第38行，__set__
value = self.field._attribute_class（value，self.field，obj ）
文件/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py，第21行，__init__
super（HStoreDictionary，self）.__ init__ （value，** params）
ValueError：字典更新序列元素＃0的长度为1; 2需要
代码是：
tmp = Item.objects.where（HE（kv）。contains（{'key'：value}））
如果tmp.count（） > 0：
item_id = tmp [0] .id，
尝试访问的值我不明白更新序列的消息。当我使用游标而不是hstore queryset时，该功能起作用。错误也出现在模板渲染上，我刚刚重新启动了 uwsgi ，一切都很好，但错误后来出现
有人有个想法？
解决方案
刚跑进入这个问题。我不知道这是否与你的代码是一样的，但对我而言，根本原因是因为我忘记在$ $的最后一个参数上放入 name = c $ c> url 函数调用。
例如，以下内容会从问题引发错误：
url（r'^ foo /（？P< bar> [A-Za-z] +）/ $'，FooBar.as_view '）
但这实际上是有用的：
url（r'^ foo /（？P< bar> [A-Za-z] +）/ $'，FooBar.as_view（），name ='foo'）
追溯无效的原因是内部，Django想解析给定的位置参数作为关键字参数 kwargs ，并且由于字符串是可迭代的，因此非典型代码路径开始展开。始终在您的网址上使用 name = ！
I have a error message on django 1.4:
dictionary update sequence element #0 has length 1; 2 is required
[EDIT]
It happened when I tried when using template tag like: `{% for v in values %}:
dictionary update sequence element #0 has length 1; 2 is required
Request Method: GET
Request URL: ...
Django Version: 1.4.5
Exception Type: ValueError
Exception Value:
dictionary update sequence element #0 has length 1; 2 is required
Exception Location: /usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __init__, line 21
Python Executable: /usr/bin/uwsgi-core
Python Version: 2.7.3
Python Path:
['/var/www/',
'.',
'',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-linux2',
'/usr/lib/python2.7/lib-tk',
'/usr/lib/python2.7/lib-old',
'/usr/lib/python2.7/lib-dynload',
'/usr/local/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages',
'/usr/lib/python2.7/dist-packages/PIL',
'/usr/lib/pymodules/python2.7']
Server time: sam, 13 Jul 2013 16:15:45 +0200
Error during template rendering
In template /var/www/templates/app/index.html, error at line 172
dictionary update sequence element #0 has length 1; 2 is required
172 {% for product in products %}
Traceback Switch to copy-and-paste view
/usr/lib/python2.7/dist-packages/django/core/handlers/base.py in get_response
response = callback(request, *callback_args, **callback_kwargs)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/contrib/auth/decorators.py in _wrapped_view
return view_func(request, *args, **kwargs)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/views/decorators/http.py in inner
return func(request, *args, **kwargs)
...
▶ Local vars
./app/views.py in index
context_instance=RequestContext(request))
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/shortcuts/__init__.py in render_to_response
return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/loader.py in render_to_string
return t.render(context_instance)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
return self._render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in _render
return self.nodelist.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
bit = self.render_node(node, context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/debug.py in render_node
return node.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/loader_tags.py in render
return compiled_parent._render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in _render
return self.nodelist.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
bit = self.render_node(node, context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/debug.py in render_node
return node.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/loader_tags.py in render
result = block.nodelist.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/base.py in render
bit = self.render_node(node, context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/debug.py in render_node
return node.render(context)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/template/defaulttags.py in render
len_values = len(values)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/core/paginator.py in __len__
return len(self.object_list)
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/db/models/query.py in __len__
self._result_cache = list(self.iterator())
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/db/models/query.py in iterator
obj = model(*row[index_start:aggregate_start])
...
▶ Local vars
/usr/lib/python2.7/dist-packages/django/db/models/base.py in __init__
setattr(self, field.attname, val)
...
▶ Local vars
/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __set__
value = self.field._attribute_class(value, self.field, obj)
...
▶ Local vars
/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py in __init__
super(HStoreDictionary, self).__init__(value, **params)
...
▶ Local vars
It happens too when I try to access on a hstore queryset:
[edit]
Traceback (most recent call last):
File "manage.py", line 14, in <module>
execute_manager(settings)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 459, in execute_manager
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 382, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 196, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 232, in execute
output = self.handle(*args, **options)
File "/home/name/workspace/project/app/data/commands/my_command.py", line 60, in handle
item_id = tmp[0].id,
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 207, in __getitem__
return list(qs)[0]
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 87, in __len__
self._result_cache.extend(self._iter)
File "/usr/local/lib/python2.7/dist-packages/django/db/models/query.py", line 301, in iterator
obj = model(*row[index_start:aggregate_start])
File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 300, in __init__
setattr(self, field.attname, val)
File "/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py", line 38, in __set__
value = self.field._attribute_class(value, self.field, obj)
File "/usr/local/lib/python2.7/dist-packages/djorm_hstore/fields.py", line 21, in __init__
super(HStoreDictionary, self).__init__(value, **params)
ValueError: dictionary update sequence element #0 has length 1; 2 is required
the code is:
tmp = Item.objects.where(HE("kv").contains({'key':value}))
if tmp.count() > 0:
item_id = tmp[0].id,
I just try to access to the value I don't understand the "update sequence" message. When I use a cursor instead of hstore queryset the function works. The error come on template rendering too , I just restarted uwsgi and everything works well, but error come back later
[edit]
Has someone an idea?
解决方案
Just ran into this problem. I don't know if it's the same thing that hit your code, but for me the root cause was because I forgot to put name= on the last argument of the url function call.
For instance, the following throws the error from the question:
url(r'^foo/(?P<bar>[A-Za-z]+)/$', FooBar.as_view(), 'foo')
But this actually works:
url(r'^foo/(?P<bar>[A-Za-z]+)/$', FooBar.as_view(), name='foo')
The reason why the traceback is unhelpful is because internally, Django wants to parse the given positional argument as the keyword argument kwargs, and since a string is an iterable, an atypical code path begins to unfold. Always use name= on your urls!
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