Repeated Fields
If there is more than one field with the same name like in HTML input check boxes then the method to be used is getlist(). It will return a list containing as many items (the values) as checked boxes. If no check box was checked the list will be empty.
<html><body> <% import cgi # Mentionining the form variable instantiates a FieldStorage object # The getlist() method will return a list containing all the values # of fields with a given name colors = form.getlist('color') if not colors: # %> <p>Check at least one color</p> <%-- This form sets three fields with the name "color" --%> <form method="post" action=""> Red<input type="checkbox" name="color" value="red"> Green<input type="checkbox" name="color" value="green"> Blue<input type="checkbox" name="color" value="blue"> <input type="submit" value="Submit"> </form> <% else: # Escape the user input to avoid script injection attacks colors = map(lambda color: cgi.escape(color), colors) # %> <p>The submitted colors were "<%= ', '.join(colors) %>"</p> <p><a href="">Submit again!</a></p> <% # %> </body></html>