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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sun, 23 Sep 2012 12:45:09 -0600
Subject: Re: 'str' object does not support item assignment
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Xref: csiph.com comp.lang.python:29846

On Sun, Sep 23, 2012 at 12:31 PM, jimbo1qaz <jimmyli1528@gmail.com> wrote:
> spots[y][x]=mark fails with a "'str' object does not support item assignment" error,even though:
>>>> a=[["a"]]
>>>> a[0][0]="b"
> and:
>>>> a=[["a"]]
>>>> a[0][0]=1000000
> both work.
> Spots is a nested list created as a copy of another list.

There's not enough information to go on here to even speculate what
might be causing the error, beyond "spots probably does not have the
structure you think it does".  Please post the code that you're
actually running along with the full error traceback, and then maybe
we can help you out.  Also try printing the value of spots just before
the assignment and see what it actually looks like.