Too many values to unpack Exception

Question

I m working on a project in Django and I ve just started trying to extend the User model in order to make user profiles    Unfortunately  I ve run into a problem  Every time I try to get the user s profile inside of a template  user get template lastIP  for example   I get the following error    Environment   Request Method  GET Request URL  http   localhost 8000  Django Version  1 1 Python Version  2 6 1  Template error  In template  path to base tpl  error at line 19    Caught an exception while rendering  too many values to unpack  19                  Hello    user username       user get profile rep     How s it goin  Logout   Exception Type  TemplateSyntaxError at   Exception Value  Caught an exception while rendering  too many values to unpack    Any ideas as to what s going on or what I m doing wrong

User · Answer

try unpacking in one variable   python will handle it as a list   then unpack from the list  def returnATupleWithThreeValues        return  1 2 3  a   returnATupleWithThreeValues     a is a list  1 2 3  print a 0    list 0    1 print a 1    list 1    2 print a 2    list 2    3

User · Answer

This happens to me when I m using Jinja2 for templates  The problem can be solved by running the development server using the runserver plus command from django extensions    It uses the werkzeug debugger which also happens to be a lot better and has a very nice interactive debugging console  It does some ajax magic to launch a python shell at any frame  in the call stack  so you can debug

User · Answer

That exception means that you are trying to unpack a tuple  but the tuple has too many values with respect to the number of target variables  For example  this work  and prints 1  then 2  then 3  def returnATupleWithThreeValues        return  1 2 3  a b c   returnATupleWithThreeValues   print a print b print c   But this raises your error  def returnATupleWithThreeValues        return  1 2 3  a b   returnATupleWithThreeValues   print a print b   raises  Traceback  most recent call last     File  c py   line 3  in       a b   returnATupleWithThreeValues   ValueError  too many values to unpack   Now  the reason why this happens in your case  I don t know  but maybe this answer will point you in the right direction

User · Answer

Most likely there is an error somewhere in the get profile   call  In your view  before you return the request object  put this line   request user get profile     It should raise the error  and give you a more detailed traceback  which you can then use to further debug

User · Answer

This problem looked familiar so I thought I d see if I could replicate from the limited amount of information  A quick search turned up an entry in James Bennett s blog here which mentions that when working with the UserProfile to extend the User model a common mistake in settings py can cause Django to throw this error  To quote the blog entry   The value of the setting is not  quot appname models modelname quot   it s just  quot appname modelname quot   The reason is that Django is not using this to do a direct import  instead  it s using an internal model-loading function which only wants the name of the app and the name of the model  Trying to do things like  quot appname models modelname quot  or  quot projectname appname models modelname quot  in the AUTH PROFILE MODULE setting will cause Django to blow up with the dreaded  quot too many values to unpack quot  error  so make sure you ve put  quot appname modelname quot   and nothing else  in the value of AUTH PROFILE MODULE   If the OP had copied more of the traceback I would expect to see something like the one below which I was able to duplicate by adding  quot models quot  to my AUTH PROFILE MODULE setting  TemplateSyntaxError at    Caught an exception while rendering  too many values to unpack  Original Traceback  most recent call last     File  quot  home brandon Development DJANGO VERSIONS Django-1 0 django template debug py quot   line 71  in render node     result   node render context    File  quot  home brandon Development DJANGO VERSIONS Django-1 0 django template debug py quot   line 87  in render     output   force unicode self filter expression resolve context     File  quot  home brandon Development DJANGO VERSIONS Django-1 0 django template   init   py quot   line 535  in resolve     obj   self var resolve context    File  quot  home brandon Development DJANGO VERSIONS Django-1 0 django template   init   py quot   line 676  in resolve     value   self  resolve lookup context    File  quot  home brandon Development DJANGO VERSIONS Django-1 0 django template   init   py quot   line 711  in  resolve lookup     current   current     File  quot  home brandon Development DJANGO VERSIONS Django-1 0 django contrib auth models py quot   line 291  in get profile     app label  model name   settings AUTH PROFILE MODULE split      ValueError  too many values to unpack  This I think is one of the few cases where Django still has a bit of import magic that tends to cause confusion when a small error doesn t throw the expected exception  You can see at the end of the traceback that I posted how using anything other than the form  quot appname modelname quot  for the AUTH PROFILE MODULE would cause the line  quot app label  model name   settings AUTH PROFILE MODULE split      quot   to throw the  quot too many values to unpack quot  error  I m 99  sure that this was the original problem encountered here

[python] "Too many values to unpack" Exception

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