call the function ugettext with an argument string "Please correct the duplicate data for %(field_name)s which must be unique for,
return ugettext ( "Please correct the duplicate data for %(field_name)s " "which must be unique for the %(lookup)s in %(date_field)s." ) % { 'field_name' : date_check [ 2 ] , 'date_field' : date_check [ 3 ] , 'lookup' : six . text_type ( date_check [ 1 ] ) , }