Django forms: need more than 1 value to unpack

Question

I'm a newer to Python, and I am having a problem with Django's forms:

  args="[('job_201404181748_1712666','job_201404181748_1712666')]"
  jobid = forms.ChoiceField(choices=args)

This raised ValueError: need more than 1 value to unpack. If I replace args with a string, then it works ok:

 jobid = forms.ChoiceField(choices=[('job_201404181748_1712666','job_201404181748_1712666')])

I don't know why. Can anyone help?

Here 'eval' function just evaluates your string 'args' to List. — Tanveer Alam, Apr 18 '14 at 11:13
While I am sure it could work, I would advise against arbitrary use of the `eval` function. It is seen as quick&dirty and could have some nasty side effect, especially in web applications dealing with user input. I never had to resort to using `eval`, and I am confident that @lanyun could write his code in a way that avoids it as well. — Roy Prins, Apr 18 '14 at 11:17

score 4 · Accepted Answer · answered Apr 18 '14 at 11:02

4

Try args without the surrounding quotes. By surrounding it with quotes, you make args into a string. The ChoiceField expect a list of choices.

in short, make line 33 look like:

 args=[('job_201404181748_1712666','job_201404181748_1712666')]

answered Apr 18 '14 at 11:02

Roy Prins

score 1 · Answer 2 · edited Apr 18 '14 at 11:53

1

You need to remove the quotes

args=[('job_201404181748_1712666','job_201404181748_1712666')]

edited Apr 18 '14 at 11:53

yprez

answered Apr 18 '14 at 11:01

dhana

2 Answers2