[Tutor] cgi FieldStorage __str__ problem - I think...

[Simon Brunning]

> From:	Remco Gerlich [SMTP:scarblac@pino.selwerd.nl]
> > I set up a template for the email as follows:
> > 
> > mailtemplate = '''From: %(email)s
> > Subject: %(subject)s
> > Email from %(name)s
> > %(comments)s'''
> > 
> > Then I substitute the data from the form into the template as follows:
> > 
> > form = cgi.FieldStorage()
> > mailtext = mailtemplate % form
> > 
> > Trouble is, the mailtext field ends up looking like this:
> > 
> > From: MiniFieldStorage('email', 'a@b.c')
> > Subject: MiniFieldStorage('subject', 'Spam')
> > Email from MiniFieldStorage('name', 'Fred')
> > MiniFieldStorage('comments', 'Egg and chips...')
> > 
> > Looks to me like the FieldStorage object's values are instances of some
> > MiniFieldStorage class, and the __str__ method of that class is just
> > returning the __repr__. Is this correct?
> 
> Yes. The actual value is in form["email"].value, and so on.
> 
> > If so, what do I do about it?
> 
> Maybe the easiest way is to make a tiny wrapper class that calls .value:
> 
> class FieldStorageWrapper:
>    def __init__(self, fieldstorage):
>       self.fieldstorage = fieldstorage
>    def __getitem__(self, name):
>       return self.fieldstorage[name].value
> 
> mailtext = mailtemplate % FieldStorageWrapper(form)
 
I ended up with the brutally simple:

form = cgi.FieldStorage()
formstrings = {}
for formfield in form.keys():
    formstrings[formfield] = form[formfield].value
mailtext = mailtemplate % formstrings

(I tried form.values() first, but the FieldStorage object doesn't seem to
support it.)

Not pretty, but it works. Much like myself, really.
 
> Or maybe trying to do this with a single % call is a bit too cute.
 
Yeah, but it would have been cool, no?

Thanks, Remco and Roman.

Cheers,
Simon Brunning
TriSystems Ltd.
sbrunning@trisystems.co.uk




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