diff --git a/Util/call_types.py b/Util/call_types.py
index fe175f1..c4dc715 100644
--- a/Util/call_types.py
+++ b/Util/call_types.py
@@ -6,4 +6,4 @@ class CallTypes():
             ('followup_call', 'Follow up call'),
         ]
 
-        return call_types
\ No newline at end of file
+        return call_types
diff --git a/Util/interest.py b/Util/interest.py
index dc42c8f..1e6fcd5 100644
--- a/Util/interest.py
+++ b/Util/interest.py
@@ -8,4 +8,4 @@ class Interest():
             ('3', '3 - Interés alto, generar venta')
         ]
 
-        return interest_levels
\ No newline at end of file
+        return interest_levels
diff --git a/call.py b/call.py
index df2abf3..6669ad3 100644
--- a/call.py
+++ b/call.py
@@ -1,12 +1,13 @@
-from trytond.model import ModelSQL, ModelView, fields 
+from trytond.model import ModelSQL, ModelView, fields
 from datetime import date
 
 from .Util.interest import Interest
 from .Util.call_types import CallTypes
 
+
 class Call(ModelSQL, ModelView):
     'Llamada'
-    
+
     __name__ = 'sale.call'
 
     date = fields.Date('Date')
@@ -19,4 +20,4 @@ class Call(ModelSQL, ModelView):
 
     @classmethod
     def default_date(cls):
-        return date.today()
\ No newline at end of file
+        return date.today()
diff --git a/prospect.py b/prospect.py
index 82c44f4..3f3996c 100644
--- a/prospect.py
+++ b/prospect.py
@@ -1,6 +1,7 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.model import ModelSQL, ModelView, fields 
+from trytond.model import ModelSQL, ModelView, fields
+
 
 class Prospect(ModelSQL, ModelView):
     'Prospecto'
@@ -9,14 +10,15 @@ class Prospect(ModelSQL, ModelView):
     name = fields.Char('Name')
     city = fields.Char('City')
 
-    contact_methods = fields.One2Many('prospect.contact_method', 'prospect', 'Contact methods') 
+    contact_methods = fields.One2Many(
+        'prospect.contact_method', 'prospect', 'Contact methods')
 
 
 class ContactMethod(ModelSQL, ModelView):
     'Mecanismo de contacto'
     __name__ = 'prospect.contact_method'
     _rec_name = 'value'
-    
+
     _type = [
         ('phone', 'Phone'),
         ('mobile', 'Mobile'),
@@ -27,4 +29,3 @@ class ContactMethod(ModelSQL, ModelView):
     value = fields.Char('Value')
 
     prospect = fields.Many2One('sale.prospect', 'Prospect')
-    
diff --git a/prospect_trace.py b/prospect_trace.py
index ebab263..7013e88 100644
--- a/prospect_trace.py
+++ b/prospect_trace.py
@@ -1,23 +1,27 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
-from trytond.model import ModelSQL, ModelView, fields 
+from trytond.model import ModelSQL, ModelView, fields
 from .Util.interest import Interest
 
+
 class ProspectTrace(ModelSQL, ModelView):
     'Seguimiento de un prospecto'
-    
+
     __name__ = 'sale.prospect_trace'
 
     prospect = fields.Many2One('sale.prospect', 'Prospect')
     prospect_name = fields.Char('Name')
-    prospect_contact = fields.Many2One('prospect.contact_method', 'Contact method')
-    prospect_city = fields.Char('City') 
+    prospect_contact = fields.Many2One(
+        'prospect.contact_method', 'Contact method')
+    prospect_city = fields.Char('City')
 
-    calls = fields.One2Many('sale.call', 'prospect_trace', "Calls") 
+    calls = fields.One2Many('sale.call', 'prospect_trace', "Calls")
+
+    _interest_field_type = fields.Selection(
+        Interest.get_interest_levels(), 'Interest')
+    current_interest = fields.Function(
+        _interest_field_type, '_get_current_interest')
 
-    _interest_field_type = fields.Selection(Interest.get_interest_levels(), 'Interest')
-    current_interest = fields.Function(_interest_field_type, '_get_current_interest')
-    
     @fields.depends('prospect')
     def on_change_prospect(self):
         if self.prospect:
@@ -26,4 +30,3 @@ class ProspectTrace(ModelSQL, ModelView):
 
     def _get_current_interest(self, name):
         return self.calls[-1].interest
-