[Tutor] How do I fix this ValueError?

[Nathan Pinno]

I think it means that I can't store the data as a dictionary unless I store 
both the username and passcard as username|passcard. Am I right?
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----- Original Message ----- 
From: <jfouhy at paradise.net.nz>
To: "Tutor mailing list" <tutor at python.org>
Sent: Tuesday, August 09, 2005 7:13 PM
Subject: Re: [Tutor] How do I fix this ValueError?


> Quoting Nathan Pinno <falcon3166 at hotmail.com>:
>
>> Here is the error:
>>
>> Traceback (most recent call last):
>>  File "D:\Python24\password.py", line 91, in -toplevel-
>>  save_file(sitelist)
>>  File "D:\Python24\password.py", line 22, in save_file
>>  for site,ID,passcard in sitelist.items():
>> ValueError: need more than 2 values to unpack
>>
>> Here is the code:
>>
>> sitelist = {}
>
> sitelist is a dictionary.  Let's see what the .items() method on 
> dictionaries does:
>
>>>> d = { 1:'foo', 2:'bar', 3:'baz' }
>>>> d.items()
> [(1, 'foo'), (2, 'bar'), (3, 'baz')]
>
> So, if we iterate over d.items(), we are iterating over a list of tuples, 
> each
> two elements long.
>
>>>> for item in d.items():
> ...  print item
> ...
> (1, 'foo')
> (2, 'bar')
> (3, 'baz')
>
> Now, we can "unpack" tuples.  For example:
>
>>>> t = (1, 2)
>>>> x, y = t
>>>> x
> 1
>>>> y
> 2
>
> This only works if both sides of the = have the same number of things.
>
>>>> t = (1, 2, 3)
>>>> x, y = t            # Not enough variables on the left hand side.
> Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
> ValueError: too many values to unpack
>>>> x, y, z, w = t      # Too many variables on the left hand side.
> Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
> ValueError: need more than 3 values to unpack
>
> Now can you figure out what the ValueError you were getting means?
>
> -- 
> John.
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