TypeError: iterable argument required

[Νικόλαος Κούρας]

On 4 Απρ, 17:38, Mel <mwil... at the-wire.com> wrote:
> Íéêüëáïò Êïýñáò wrote:
> >> > iam getting the following error which i dont understand
>
> >> > **************************************************************
> >> > 163         # insert guest comments into database if form was
> >> > submitted
> >> >   164         if "@" in mail and comment not in ("Ó÷ïëéÜóôå Þ ñùôÞóôå
> >> > ìå ó÷åôéêÜ....", ""):
> >> >   165                 try:
> >> >   166                         cursor.execute( '''INSERT INTO
> >> > users(mail, comment) VALUES(%s, %s)''', (mail, comment) )
> >> > mail = None, comment = None
>
> >> > TypeError: iterable argument required
> >> >       args = ('iterable argument required',)
>
> > In my original question can you explain to me what the meaning of the
> > following error is?
>
> > ********************************************
> > mail = None, comment = None
> > TypeError: iterable argument required
> >       args = ('iterable argument required',)
> > *********************************************
>
> > Also i noticed that if i append a query string in the end of a url
> > with the varibble mail attached like
>
> >http://superhost.gr/hosting.html?mail=test
>
> > then page hosting.html does load without any problem.
>
> > If i remove the query string from the ned of the URL then i'am getting
> > the error message i posted.
>
> > So its not that the if condition is wrong but something happens with
> > the form variable 'mail' .....
>
> My wild guess is that the trouble is in `if "@" in mail` .  You can only
> test somthing `in` something if the second thing is iterable.  So when
> you don't supply a value via `?mail=' -- maybe the code that sets the
> value of `mail` from the URL (code you don't show us) sets `mail=None`,
> your server-side code blows up.  Things would be simpler if you included
> a traceback in your error logging.
>
>         Mel.

I think you and Peter are right. Somehow mail variable which is taken
its value from a form field is assigned a None value.

Here is the hosting.html part of the code that include the form
variable mail

<form method="post" action="">

<input type="text" name="mail" value="Ποιό είναι το email σου?"><br>
<textarea name="comment" cols="40" rows="5">
Σχολιάστε ή ρωτήστε με σχετικά....
</textarea><br>

<input type="hidden" name="page" value="hosting.html">
<input type="submit" value="Ρώτα">

</form>

But as you can see it has a default value of "Ποιό είναι το email
σου?"
So how can be of a NoneType ?

>  Things would be simpler if you included a traceback in your error logging.

You mean the web server's last error log messages for the error.log
file?