Dynamic Web content and forms processing in Python

This function takes three arguments: parent is the Element instance under which the content is to be attached; form is the FieldStorage instance; and cName is the name of the control to be displayed.

This function is not designed to deal with file controls. For the special logic needed in that case, see Section 4.1.1, “Special considerations for uploading files”.

# - - -   s h o w C o n t r o l

def showControl ( parent, form, cName ):
    '''Display the value of one form control.
    '''

So that we don't have to worry about whether a control has no values, one value, or multiple values, we'll use the .getlist() method to return a list of the values as strings. Then we'll join the elements of that list together with a comma and a space between each element to form the displayed string..

    cValues  =  form.getlist ( cName )
    display  =  ', '.join ( cValues )

We're ready to generate XHTML: a div element containing the string “cName=safe”.

    div  =  et.SubElement ( parent, 'div' )
    div.text  =  '%s=[%s]' % (cName, display )