Hidden CGI fields in HTML

Oleg Broytmann phd at emerald.netskate.ru
Tue Aug 10 12:47:27 CEST 1999


On Tue, 10 Aug 1999, Ian Clarke wrote:
> On a related issue, you are clearly experienced in using CGI with
> Python.  I couldn't understand why cgi.FieldStorage returned a
> dictionary which contained MiniFieldStorage objects (which must be
> accessed using the .value field) rather than just the data itself.  This
> would be much more convenient as I see it.  Any ideas?

   There are, actually, some more issues on using FieldStorage, for
example, you cannot ask for non-existing field:

v = form["nofield"].value

   will raise KeyError. And there is no way to emulate dict.get()...

   Oh, yes, I think I know why there is .value! What if your form has more
than one value for some key? Like in the following GET:

http://my.server/my/cgi/prog.py?city=Moscow&city=Paris&city=London

   How do you get the value? How do you recognize thera are many values?
Currently, you try to ask for form["city"], if the field exists you try to
ask it for .value, but if the .value does not exists, you know it is a
list:

   for f in form["city"]:
      print f.value

> Cheers,
> 
> Ian.

Oleg.
---- 
    Oleg Broytmann        Netskate/Inter.Net.Ru        phd at emerald.netskate.ru
           Programmers don't die, they just GOSUB without RETURN.





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