diff --git a/django/didgeridoo/webshop/models.py b/django/didgeridoo/webshop/models.py
index e8008ac..005b69b 100644
--- a/django/didgeridoo/webshop/models.py
+++ b/django/didgeridoo/webshop/models.py
@@ -1,10 +1,14 @@
+#!/usr/bin/python3
+
 from django.db import models
 from django.contrib.auth.models import User
 
+
 # Create your models here.
 class Category(models.Model):
     name = models.CharField(max_length=200, unique=True)
     article = models.ForeignKey('self')
+
     def __str__(self):
         return self.name
 
@@ -12,6 +16,7 @@ class Category(models.Model):
 class Option(models.Model):
     name = models.CharField(max_length=200, unique=True)
     value = models.IntegerField(default=5)
+
     def __str__(self):
         return self.name
 
@@ -23,6 +28,7 @@ class Settings(models.Model):
 
 class ArticleStatus(models.Model):
     name = models.CharField(max_length=50, unique=True)
+
     def __str__(self):
         return self.name
 
@@ -30,6 +36,7 @@ class ArticleStatus(models.Model):
 class ExchangeRate(models.Model):
     name = models.CharField(max_length=200, unique=True)
     exchange_rate_to_chf = models.FloatField(max_length=5)
+
     def __str__(self):
         return self.name
 
@@ -40,12 +47,14 @@ class Article(models.Model):
     stock = models.FloatField(max_length=5)
     status = models.ForeignKey(ArticleStatus)
     price_in_chf = models.DecimalField(max_digits=19, decimal_places=2)
+
     def __str__(self):
         return self.name
 
 
 class OrderStatus(models.Model):
     name = models.CharField(max_length=200, unique=True)
+
     def __str__(self):
         return self.name
 
@@ -61,6 +70,7 @@ class OrderOfGoods(models.Model):
 class Picture(models.Model):
     name = models.CharField(max_length=200, unique=True)
     article = models.ForeignKey(Article, on_delete=models.CASCADE)
+
     def __str__(self):
         return self.name
 
@@ -75,14 +85,16 @@ class ShoppingCart(models.Model):
     name = models.CharField(max_length=200)
     user = models.ForeignKey(User, on_delete=models.CASCADE)
     article = models.ManyToManyField(Article)
+
     def __str__(self):
         return self.name
 
 
 class City(models.Model):
-   name = models.CharField(max_length=200)
-   zip_code = models.PositiveSmallIntegerField()
-   def __str__(self):
+    name = models.CharField(max_length=200)
+    zip_code = models.PositiveSmallIntegerField()
+
+    def __str__(self):
         return self.name
 
 
@@ -98,6 +110,6 @@ class Person(models.Model):
     street_name = models.CharField(max_length=200)
     street_number = models.CharField(max_length=4)
     user = models.OneToOneField(User, on_delete=models.CASCADE)
+
     def __str__(self):
         return self.last_name
-