problem with iteration

[Paul Hankin]

On Nov 3, 8:58 pm, Panagiotis Atmatzidis <p.atmatzi... at gmail.com>
wrote:
> Hello,
>
> I managed to write some code in order to do what I wanted: Inject code
> in the right place, in some html files. I developed the program using
> small functions, one at the time in order to see how they work. When I
> tried to put these pieces of code together I got this error:
> TypeError: iteration over non-sequence
>
> Here is the code snippet that has the issue
>
> --------------
> def injectCode(path, statcode):
>         for root, dir, files in os.walk(path, topdown=True):
>                 for name in files:
>                         html_files = re.search("html", name, flags=0)
>                         if html_files == None:
>                                 print "No html files found in your path."
>                         else:
>                                 for oldfile in html_files: <-- HERE IS THE ERROR
>                                   [rest of code here]

First step in debugging is to look at the error, and work out what's
going on. 'iteration over non-sequence' suggests that 'html_files'
isn't a sequence. If it were my program and I didn't understand, I
might add 'print html_files' before the offending line to see what it
is. That would have given something like:
<_sre.SRE_Match object at 0x86608>

Not particularly helpful, but 'sre' and 'Match' suggests something to
do with regular expressions. Given the variable name, you obviously
expected a list of files, so you could look at where html_files is
created (with a re.match call) to see why your expectation differs
from what happened. Perhaps you could add more print statements to the
loops to see what values 'files' and 'name' take.

--
Paul Hankin