docs: def editContactItem(self, contact, label, number):
          """
          Change the I{number} attribute of C{contact} to C{number}, and the
          I{label} attribute to C{label}.
  
          @type contact: L{PhoneNumber}
  
          @type label: C{unicode}
  
          @type number: C{unicode}
  
          @return: C{None}
          """
          contact.label = label
          contact.number = number