Newbie NameError problem

[Sion Arrowsmith]

 <MartinRinehart at gmail.com> wrote:
>I don't understand what I don't understand in the following:
> [ ... ]

You've already got an answer as to what's causing your name error.
But that's not your only problem. It looks like you need an
introduction to enumerate():

for line_ptr, text in enumerate(file('sample_decaf.d')):
    for char_ptr, char in enumerate(text):
        # whatever you want to do with your chacter-by-character
        # processing with line and charater positions

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