[FIX] mutable default in function signature

base_location/better_zip.py

@@ -51,7 +51,7 @@ class BetterZip(orm.Model):
             res.append((bzip.id, ", ".join(name)))
         return res
 
-    def onchange_state_id(self, cr, uid, ids, state_id=False, context={}):
+    def onchange_state_id(self, cr, uid, ids, state_id=False, context=None):
         result = {}
         if state_id:
             state = self.pool['res.country.state'].browse(cr, uid, state_id, context=context)

base_location/company.py

@@ -26,10 +26,12 @@ class ResCompany(orm.Model):
 
     _inherit = 'res.company'
 
-    def on_change_city(self, cursor, uid, ids, zip_id):
+    def on_change_city(self, cr, uid, ids, zip_id, context=None):
         result = {}
+        if context is None:
+            context = {}
         if zip_id:
-            bzip = self.pool['res.better.zip'].browse(cursor, uid, zip_id)
+            bzip = self.pool['res.better.zip'].browse(cr, uid, zip_id, context=context)
             result = {'value': {'zip': bzip.name,
                                 'country_id': bzip.country_id.id if bzip.country_id else False,
                                 'city': bzip.city,