'Remove a single field.
Arguments:
name  -- name of field to remove.'

def del_field(self, name):

    if (name in self._fields):
        fields = [i for i in self.iterables if isinstance(i, RequestField)]
        for field in fields:
            if (field['name'] == name):
                self.xml.remove(field.xml)
                self.iterables.remove(field)
                return True
    return False
