[reportlab-users] looping through text error.

[Tim Roberts]

Siddique, Halil wrote:

>

> Hi all,

>

> I’ve only just looked at reportlab for the last few days so please

> bear with me.

>

> I have a script that was already in use and tried to modify it, what

> the code should do is loop through all the records, and append them to

> a list, butIcannot get it to work.

>

> ...

>

> When the code goes into thesecondwhileloop (mySelectedGroups), it

> loops through and adds the data to the variable data, but when it

> exits the loop and goes into story.append(data),an error occurs

>

> AttributeError:'list'objecthasnoattribute'getKeepWithNext'

>

> So my question is how to a list the values that are looped into my pdf? 


This happens because "data" is a Python list, not a Platypus flowable. 
The "story" variable that you pass to doc.build must be a list of
flowables.  Your first loop does that, but when you add a plain Python
list, it doesn't work.  Remember, when you call list.append, that adds
it parameter as a single item.  So:
    x = [1,2,3]
    y = [4,5,6]
    x.append( y )
x now has [1,2,3,[4,5,6]]  That is, x contains 4 items, the last of
which happens to be a list.

I don't quite understand why you accumulate the second loop into a
separate list (data) instead of just appending it straight to story, but
that's a separate matter.  You can add certainly add the CONTENTS of a
list onto another list, in two ways:
    story += data
or
    story.extend( data )

So:
    x = [1,2,3]
    y = [4,5,6]
    x += y
x now contains [1,2,3,4,5,6].

-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.

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