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 happe

Answer 1

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.

Answer 2

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<bar>[A-Za-z]+)/$', views.FooBar.as_view(), 'foo')
path('foo/{slug:bar}/', views.FooBar, 'foo')

But these actually work:

url(r'^foo/(?P<bar>[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!

Answer 3

I hit this error calling:

dict(my_data)

I fixed this with:

import json

json.loads(my_data)

Answer 4

You are sending one parameter incorrectly; it should be a dictionary object:

• Wrong: func(a=r)

• Correct: func(a={'x':y})

Answer 5

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

Answer 6

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'),]