Error dictionary update sequence element 0 has length 1 2 is required on Django 1 4

Question

I have an error message on django 1 4      dictionary update sequence element  0 has length 1  2 is required    EDIT   It happened when I tried using a 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  lt module gt      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    gt  0       item id   tmp 0  id    I m just trying to access the value   I don t understand the  update sequence  message   When I use a cursor instead of hstore queryset   the function works  The error comes on template rendering too   I just restarted uwsgi and everything works well  but the error comes back later    edit   Has someone an idea

User · Answer

I faced the above mentioned problem when I forgot to pass a keyword argument name to url() function.

Code with error

 url(r"^testing/$", views.testing, "testing")

Code without error

url(r"^testing/$", views.testing, name="testing")

So finally I removed the above error in this way. It might be something different in your case. So check your url patterns in urls.py.

User · Answer

I encountered this issue when trying to invoke the update method with a parameter of a wrong type  The expected dict was     foo   True    The one that was passed was     foo    True     make sure you check all the parameters you pass are of the expected type

User · Answer

Solution raquo   Pass a keyword argument name with value as your view name e g home or home-view etc  to url   function   Throws Error raquo   url r  home     common views view1    home     Correct raquo   url r  home     common views view1   name  home

User · Answer

The error should be with the params  Please verify that the params is a dictionary object  If it is just a list tuple of arguments use only one     params  instead of two      params   This will explode the list tuple into the proper amount of arguments   Or  if the params is coming from some other part of code as a JSON file  please do json loads params   because the JSON objects sometimes behave as string and so you need to make it as a JSON using load from string  loads    super HStoreDictionary  self    init   value    params    Hope this helps

User · Answer

Here is how I encountered this error in Django and fixed it  Code with error urlpatterns    path  home    views home   home      Correction urlpatterns    path  home    views home  name  home

User · Answer

I hit this error calling  dict my data   I fixed this with  import json  json loads my data

User · Answer

Here is the reproduced error     gt  gt  gt  d       gt  gt  gt  d update   1     Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  ValueError  dictionary update sequence element  0 has length 1  2 is required  gt  gt  gt    gt  gt  gt  d     gt  gt  gt    gt  gt  gt  d update   1  2     gt  gt  gt  d  1  2   gt  gt  gt    gt  gt  gt  d update  hello some string   Traceback  most recent call last   File   lt stdin gt    line 1  in  lt module gt    ValueError  dictionary update sequence element  0 has length 1  2 is required  gt  gt  gt     If you give the sequence and any element length is 1 and required two then we will get this kind of error   See the above code  First time I gave the sequence with tuple and it s length 1  then we got the error and dictionary is not updated  second time I gave inside tuple with with two elements  dictionary got updated

User · Answer

I got this error when I was messing around with string and dictionary   dict1     taras    vaskiv    iruna    vaskiv   str1   str dict1  dict str1      ValueError  dictionary update sequence element  0 has length 1  2 is required   So what you actually got to do to get dict from string is   dic2   eval str1  dic2   taras    vaskiv    iruna    vaskiv     Or in matter of security we can use literal eval  from ast import literal eval

User · Answer

I too had a similar type of problem   The solution is simple   just dont try to enter NULL or None value in values or u might have to use Something like thisdic update   key value

User · Answer

You are sending one parameter incorrectly  it should be a dictionary object    Wrong  func a r  Correct  func a   x  y

User · Answer

In my case  my get context data in one of my views was returning return render self request   es connection error html     error  error    in a try catch block instead of returning context

User · Answer

I got the same issue and found that it was due to wrong parameters  In views py  I used    return render request   demo html    items   items         But I found the issue    items   items   Changing to   items   items  resolved the issue

User · Answer

Error in your question is raised when you try something like following    gt  gt  gt  a dictionary       gt  gt  gt  a dictionary update   1    Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  ValueError  dictionary update sequence element  0 has length 1  2 is required   It s hard to tell where is the cause in your code unless you show your code  full traceback

User · Answer

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  or path in Django 2 0   function call   For instance  the following functions throw the error from the question   url r  foo   P lt bar gt  A-Za-z        views FooBar as view     foo   path  foo  slug bar     views FooBar   foo     But these actually work   url r  foo   P lt bar gt  A-Za-z        views FooBar as view    name  foo   path  foo  slug bar     views FooBar  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

[python] Error: "dictionary update sequence element #0 has length 1; 2 is required" on Django 1.4

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