Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!newsfeed.kamp.net!newsfeed.kamp.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Date: Tue, 07 Feb 2012 22:25:13 +0100
From: Aaron France <a.france.mailinglists@gmail.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20120131 Thunderbird/10.0
MIME-Version: 1.0
To: python-list@python.org
Subject: Re: iterating over list with one mising value
References: <1328646189.84221.YahooMailClassic@web161206.mail.bf1.yahoo.com> <4F319406.8060206@mrabarnett.plus.com>
In-Reply-To: <4F319406.8060206@mrabarnett.plus.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.5515.1328649998.27778.python-list@python.org>
Lines: 57
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19984

On 02/07/2012 10:13 PM, MRAB wrote:
> On 07/02/2012 20:23, Sammy Danso wrote:
>> Hi Expert,
>> Thanks for your responses and help. thought I should provide more
>> information for clarity.
> >
>> Please find the error message below for more information
>>
>
>> for (key, value) in wordFreq2:
>> ValueError: need more than 1 value to unpack
>>
>> this is a sample of my data
>>
>> ['with', 3, 'which', 1, 'were', 2, 'well', 1, 'water', 1, 'was', 4,
>> 'two', 1, 'to', 2, 'through', 1, 'thlabour', 1, 'these', 1, 'theat', 1,
>> 'the', 8, 'tetanus', 1, 'started', 1, 'size', 1, 'scent', 1,
>> 'respectively', 1, 'received', 1, 'problems', 2, 'prince', 1,
>> 'pregnancy', 1, 'poured', 1, 'peace', 1, 'pains', 1, 'painless', 1,
>> 'out', 1, 'of', 1, 'noseat', 1, 'nose', 2, 'no', 2, 'maternity', 1,
>> 'malformation', 1, 'made', 1, 'lower', 1, 'labour/delivery', 2,
>> 'kintampo', 1, 'into', 1, 'injections', 1, 'in', 3, 'i', 2, 'hospital',
>> 1, 'home', 1, 'him', 1, 'having', 1, 'had', 2, 'green', 1, 'gave', 1,
>> 'flowing', 2, 'encountered', 1, 'eleven', 1, 'during', 3, 'district', 1,
>> 'difficulty', 1, 'cord', 1, 'consecutive', 1, 'colour', 1, 'cleared', 1,
>> 'child', 1, 'checkups', 1, 'came', 1, 'but', 2, 'breathing', 2,
>> 'breath', 1, 'blood', 2, 'bleeding', 1, 'birth', 4, 'before', 1, 'bad',
>> 1, 'average', 1, 'at', 2, 'assist', 1, 'artificial', 1, 'around', 2,
>> 'antenatal', 1, 'and', 5, 'an', 1, 'ambrical', 1, 'air', 1, 'abdominal',
>> 1, '600am', 1, '100pm', 1, '', 3, 'other']
>>
>> What I would like to do is to pad the last value 'other' with a default
>> so I can iterate sucessfully
>>
>> my desired ouput is the format below in a text file.
>> with 3
>> which 3
>> were 2
>> ..
>> .
>> .
>> other
>>
> The line:
>
> for (key, value) in wordFreq2:
>
> attempts to iterate through the list wordFreq2, where each item in the
> list is a _pair_ of values.
>
> However, what you have is a list of _single_ values, alternating string
> and number.
>
> That's why it's complaining that it can't unpack.
for i in range(0, len(x), 2):
     print x[i-1], x[i]