443 

   443 

   444     def _render(self, form, field, renderer):

   444     def _render(self, form, field, renderer):

   445         curvalues, attrs = self.values_and_attributes(form, field)

   445         curvalues, attrs = self.values_and_attributes(form, field)

   446         options = []

   446         options = []

   447         optgroup_opened = False

   447         optgroup_opened = False

   449             try:

   450             try:

   450                 label, value, oattrs = option

   451                 label, value, oattrs = option

   451             except ValueError:

   452             except ValueError:

   452                 label, value = option

   453                 label, value = option

   453                 oattrs = {}

   454                 oattrs = {}