diff --git a/diary.py b/diary.py
index d8a25bd..60efbf5 100644
--- a/diary.py
+++ b/diary.py
@@ -1,23 +1,27 @@
 from trytond.model import (
     ModelSQL, ModelView, fields)
 
+
 class Diary(ModelSQL, ModelView):
     'Diary'
     __name__ = 'optical_equipment_maintenance.diary'
     _rec_name = 'code'
-    
-    code = fields.Char("Code", select=True,states={'readonly': True })
+
+    code = fields.Char("Code", select=True, states={'readonly': True})
     date_expected = fields.DateTime("Expected Date", required=True)
     date_estimated = fields.DateTime("Estimated Date")
     date_end = fields.DateTime("Date End")
-    maintenance_service = fields.Many2One('optical_equipment_maintenance.service', 'Maintenance Service', required=True)
+    maintenance_service = fields.Many2One(
+        'optical_equipment_maintenance.service', 'Maintenance Service',
+        required=True)
     technical = fields.Many2One('company.employee', "Technical", required=True)
     state = fields.Selection([('draft', "Draft"),
                               ('agended', "Agended"),
                               ('in_progress', "In Progress"),
                               ('failed', "Failed"),
                               ('finished', "Finished")
-                              ], "State", required=True, readonly=True, sort=True)
+                              ], "State",
+                             required=True, readonly=True, sort=True)
 
     @classmethod
     def default_state(self):