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: <[EMAIL PROTECTED]>
To: "Tutor mailing list" <tutor@python.org>
Sent: Tuesday, August 09, 2005 7:13 PM
Subject: Re: [Tutor] How do I fix this ValueError?
> Quoting Nathan Pinno <[EMAIL PROTECTED]>:
>
>> 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.
> _______________________________________________
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
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