questions concerning cgi.FieldStorage(keep_blank_values=1)

[Jonas Meurer]

hello,

i'm quite new to python. currently i try to write a web application with
python cgi scripts.

in this application, i need keys to be delivered with the url, some with
and some without value (for example 'script.py?key1 &key2=foo'.

i've searched the internet, and already figured out that i need to give
non-empty keep_blank_valu es as argument to cgi.FieldStorag e, to make it
not cut all the empty keywords.

anyway, this still doesn't work really good:

---snip---
form = cgi.FieldStorag e(keep_blank_va lues=1)

print 'list keys with form.keys():'
keys = form.keys()
keys.sort()
for key in keys:
print key
---snip---

if i request the script with script.py?key1& key2=foo, it will output:
list keys with form.keys():
key2

any suggestions about how to make form.keys() contain the blank keys as
well?

bye
jonas

[Daniel Lichtenberger]

Re: questions concerning cgi.FieldStorag e(keep_blank_va lues=1)

Hi,

Jonas Meurer wrote:
[color=blue]
> if i request the script with script.py?key1& key2=foo, it will output:
> list keys with form.keys():
> key2
>
> any suggestions about how to make form.keys() contain the blank keys
> as well?[/color]

"key1" isn't a valid parameter, to supply an empty key you would write
script.py?key1= &key2=foo

Then cgi.FieldStorag e also includes key1.

bye,
Daniel

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[Jonas Meurer]

Re: questions concerning cgi.FieldStorag e(keep_blank_va lues=1)

On 20/02/2005 Daniel Lichtenberger wrote:[color=blue][color=green]
> > any suggestions about how to make form.keys() contain the blank keys
> > as well?[/color]
>
> "key1" isn't a valid parameter, to supply an empty key you would write
> script.py?key1= &key2=foo
>
> Then cgi.FieldStorag e also includes key1.[/color]

great, it works. but is there no way to use single keywords as GET
argument?

bye
jonas

[Daniel Lichtenberger]

Re: questions concerning cgi.FieldStorag e(keep_blank_va lues=1)

Jonas Meurer wrote:[color=blue][color=green]
>>"key1" isn't a valid parameter, to supply an empty key you would write
>>script.py?key 1=&key2=foo
>>
>>Then cgi.FieldStorag e also includes key1.[/color]
>
> great, it works. but is there no way to use single keywords as GET
> argument?[/color]

You could manually parse the request string (CGI stores the request
string as an environment variable, you can retrieve it via
os.environ["REQUEST_STRING "]), but why not add "=1" (or "=") to your
keywords?

bye,
Daniel

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[Michele Simionato]

Re: questions concerning cgi.FieldStorag e(keep_blank_va lues=1)

Jonas:[color=blue]
> in this application, i need keys to be delivered with the url, some[/color]
with[color=blue]
> and some without value (for example 'script.py?key1 &key2=foo'.[/color]

You are missing an "=" sign after key1. Confront with this example:

from cgi import parse_qsl

QS = "x=1&y=2&x=3&z= &y=4"
print parse_qsl(QS)
print parse_qsl(QS, keep_blank_valu es=True)

which gives

[('x', '1'), ('y', '2'), ('x', '3'), ('y', '4')]
[('x', '1'), ('y', '2'), ('x', '3'), ('z', ''), ('y', '4')]

Here the blank value "z=" is converted into "z=''".


Michele Simionato