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    <p>Let me start with a more simple image list to act as a cleaner example:</p> <pre><code>images = [ (1, u'True', u'file_one.jpg', u'2013'), (2, u'False', u'file_two.jpg', u'2012'), ] </code></pre> <p>You then refine that list of tuples to be choices to use for the form values, essentially the goal is to provide a list of two value tuples to wtforms:</p> <pre><code>[ (1,'file_one.jpg'), (2,'file_two.jpg') ] </code></pre> <p>But you use this list comprehension:</p> <pre><code>rows = [(str(x[0]), x) for x in images] form.images.choices = rows </code></pre> <p>Which will generate:</p> <pre><code>[ (1, (1, u'True', u'file_one.jpg', u'2013')), (2, (2, u'False', u'file_two.jpg', u'2012')) ] </code></pre> <p>Which isn't useful to wtforms, it doesn't know how to handle that tuple within a tuple. So you need to pick the value for the label, or format that data better.</p> <p>So either alter your list comprehension to pick a better description, which will get you to the goal:</p> <pre><code>rows = [(x[0],x[2]) for x in images] </code></pre> <p>Or join all the data together to give a more.. verbose but potentially useful to you description:</p> <pre><code>rows = [(x[0], "\t|".join([str(y) for y in x])) for x in images] </code></pre> <p>Which will result in:</p> <pre><code>[ (1, '1\t|True\t|file_one.jpg\t|2013'), (2, '2\t|False\t|file_two.jpg\t|2012') ] </code></pre> <p>Read up more on <a href="http://docs.python.org/2/tutorial/datastructures.html#list-comprehensions" rel="nofollow">list comprehensions</a>.</p>
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    1. POFormatting the descriptions of a Radio Button Form
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    1. POFormatting the descriptions of a Radio Button Form
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    1. COI don't see the tab when I view the form though. It looks like 1 |True |file_one.jpg |2013 2 |False |file_two.jpg |2012
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    2. COIf you're viewing it in your web browser, you won't-- Web browsers don't care about white-space, anything more then one space will be ignored. If you view the source-code of the webpage, you'll see the tabs.
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