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Python cgi.FieldStorage field delete problem.

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I get this error:

'FieldStorage' object does not support item deletion.

when I try to delete an object from from fieldstorage when it tells me I can here:

http://www.modpython.org/live/current/doc-html/pyapi-util-fstor.html

Quote

clear()
Removes all form fields. Individual form fields can be deleted using the del operator.


Ok, soooooo I tried to do something like this:

form = cgi.FieldStorage()

del form['keyname']



And it fails:

TypeError: 'FieldStorage' object does not support item deletion 
      args = ("'FieldStorage' object does not support item deletion",) 
      with_traceback = <built-in method with_traceback of TypeError object>



Q: How do you delete a field from FieldStorage?

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