diff --git a/examples/cookbook-plain/cookbook/ingredients/migrations/0001_initial.py b/examples/cookbook-plain/cookbook/ingredients/migrations/0001_initial.py
index ee8cadd..0494923 100644
--- a/examples/cookbook-plain/cookbook/ingredients/migrations/0001_initial.py
+++ b/examples/cookbook-plain/cookbook/ingredients/migrations/0001_initial.py
@@ -10,46 +10,24 @@ class Migration(migrations.Migration):
 
     initial = True
 
-    dependencies = []
+    dependencies = [
+    ]
 
     operations = [
         migrations.CreateModel(
-            name="Category",
+            name='Category',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("name", models.CharField(max_length=100)),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
             ],
         ),
         migrations.CreateModel(
-            name="Ingredient",
+            name='Ingredient',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("name", models.CharField(max_length=100)),
-                ("notes", models.TextField()),
-                (
-                    "category",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="ingredients",
-                        to="ingredients.Category",
-                    ),
-                ),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
+                ('notes', models.TextField()),
+                ('category', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='ingredients', to='ingredients.Category')),
             ],
         ),
     ]
diff --git a/examples/cookbook-plain/cookbook/ingredients/migrations/0002_auto_20161104_0050.py b/examples/cookbook-plain/cookbook/ingredients/migrations/0002_auto_20161104_0050.py
index 40c7f2b..359d4fc 100644
--- a/examples/cookbook-plain/cookbook/ingredients/migrations/0002_auto_20161104_0050.py
+++ b/examples/cookbook-plain/cookbook/ingredients/migrations/0002_auto_20161104_0050.py
@@ -7,12 +7,14 @@ from django.db import migrations, models
 
 class Migration(migrations.Migration):
 
-    dependencies = [("ingredients", "0001_initial")]
+    dependencies = [
+        ('ingredients', '0001_initial'),
+    ]
 
     operations = [
         migrations.AlterField(
-            model_name="ingredient",
-            name="notes",
+            model_name='ingredient',
+            name='notes',
             field=models.TextField(blank=True, null=True),
-        )
+        ),
     ]
diff --git a/examples/cookbook-plain/cookbook/ingredients/migrations/0003_auto_20181018_1746.py b/examples/cookbook-plain/cookbook/ingredients/migrations/0003_auto_20181018_1746.py
index 3648299..184e79e 100644
--- a/examples/cookbook-plain/cookbook/ingredients/migrations/0003_auto_20181018_1746.py
+++ b/examples/cookbook-plain/cookbook/ingredients/migrations/0003_auto_20181018_1746.py
@@ -5,10 +5,13 @@ from django.db import migrations
 
 class Migration(migrations.Migration):
 
-    dependencies = [("ingredients", "0002_auto_20161104_0050")]
+    dependencies = [
+        ('ingredients', '0002_auto_20161104_0050'),
+    ]
 
     operations = [
         migrations.AlterModelOptions(
-            name="category", options={"verbose_name_plural": "Categories"}
-        )
+            name='category',
+            options={'verbose_name_plural': 'Categories'},
+        ),
     ]
diff --git a/examples/cookbook-plain/cookbook/recipes/migrations/0001_initial.py b/examples/cookbook-plain/cookbook/recipes/migrations/0001_initial.py
index 9ce12f2..338c71a 100644
--- a/examples/cookbook-plain/cookbook/recipes/migrations/0001_initial.py
+++ b/examples/cookbook-plain/cookbook/recipes/migrations/0001_initial.py
@@ -10,61 +10,27 @@ class Migration(migrations.Migration):
 
     initial = True
 
-    dependencies = [("ingredients", "0001_initial")]
+    dependencies = [
+        ('ingredients', '0001_initial'),
+    ]
 
     operations = [
         migrations.CreateModel(
-            name="Recipe",
+            name='Recipe',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("title", models.CharField(max_length=100)),
-                ("instructions", models.TextField()),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=100)),
+                ('instructions', models.TextField()),
             ],
         ),
         migrations.CreateModel(
-            name="RecipeIngredient",
+            name='RecipeIngredient',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("amount", models.FloatField()),
-                (
-                    "unit",
-                    models.CharField(
-                        choices=[("kg", "Kilograms"), ("l", "Litres"), ("", "Units")],
-                        max_length=20,
-                    ),
-                ),
-                (
-                    "ingredient",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="used_by",
-                        to="ingredients.Ingredient",
-                    ),
-                ),
-                (
-                    "recipes",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="amounts",
-                        to="recipes.Recipe",
-                    ),
-                ),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('amount', models.FloatField()),
+                ('unit', models.CharField(choices=[('kg', 'Kilograms'), ('l', 'Litres'), ('', 'Units')], max_length=20)),
+                ('ingredient', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='used_by', to='ingredients.Ingredient')),
+                ('recipes', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='amounts', to='recipes.Recipe')),
             ],
         ),
     ]
diff --git a/examples/cookbook-plain/cookbook/recipes/migrations/0002_auto_20161104_0106.py b/examples/cookbook-plain/cookbook/recipes/migrations/0002_auto_20161104_0106.py
index fb32282..f135392 100644
--- a/examples/cookbook-plain/cookbook/recipes/migrations/0002_auto_20161104_0106.py
+++ b/examples/cookbook-plain/cookbook/recipes/migrations/0002_auto_20161104_0106.py
@@ -7,23 +7,19 @@ from django.db import migrations, models
 
 class Migration(migrations.Migration):
 
-    dependencies = [("recipes", "0001_initial")]
+    dependencies = [
+        ('recipes', '0001_initial'),
+    ]
 
     operations = [
         migrations.RenameField(
-            model_name="recipeingredient", old_name="recipes", new_name="recipe"
+            model_name='recipeingredient',
+            old_name='recipes',
+            new_name='recipe',
         ),
         migrations.AlterField(
-            model_name="recipeingredient",
-            name="unit",
-            field=models.CharField(
-                choices=[
-                    (b"unit", b"Units"),
-                    (b"kg", b"Kilograms"),
-                    (b"l", b"Litres"),
-                    (b"st", b"Shots"),
-                ],
-                max_length=20,
-            ),
+            model_name='recipeingredient',
+            name='unit',
+            field=models.CharField(choices=[(b'unit', b'Units'), (b'kg', b'Kilograms'), (b'l', b'Litres'), (b'st', b'Shots')], max_length=20),
         ),
     ]
diff --git a/examples/cookbook-plain/cookbook/recipes/migrations/0003_auto_20181018_1728.py b/examples/cookbook-plain/cookbook/recipes/migrations/0003_auto_20181018_1728.py
index 05fed05..7a8df49 100644
--- a/examples/cookbook-plain/cookbook/recipes/migrations/0003_auto_20181018_1728.py
+++ b/examples/cookbook-plain/cookbook/recipes/migrations/0003_auto_20181018_1728.py
@@ -5,20 +5,14 @@ from django.db import migrations, models
 
 class Migration(migrations.Migration):
 
-    dependencies = [("recipes", "0002_auto_20161104_0106")]
+    dependencies = [
+        ('recipes', '0002_auto_20161104_0106'),
+    ]
 
     operations = [
         migrations.AlterField(
-            model_name="recipeingredient",
-            name="unit",
-            field=models.CharField(
-                choices=[
-                    ("unit", "Units"),
-                    ("kg", "Kilograms"),
-                    ("l", "Litres"),
-                    ("st", "Shots"),
-                ],
-                max_length=20,
-            ),
-        )
+            model_name='recipeingredient',
+            name='unit',
+            field=models.CharField(choices=[('unit', 'Units'), ('kg', 'Kilograms'), ('l', 'Litres'), ('st', 'Shots')], max_length=20),
+        ),
     ]
diff --git a/examples/cookbook/cookbook/ingredients/migrations/0001_initial.py b/examples/cookbook/cookbook/ingredients/migrations/0001_initial.py
index ee8cadd..0494923 100644
--- a/examples/cookbook/cookbook/ingredients/migrations/0001_initial.py
+++ b/examples/cookbook/cookbook/ingredients/migrations/0001_initial.py
@@ -10,46 +10,24 @@ class Migration(migrations.Migration):
 
     initial = True
 
-    dependencies = []
+    dependencies = [
+    ]
 
     operations = [
         migrations.CreateModel(
-            name="Category",
+            name='Category',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("name", models.CharField(max_length=100)),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
             ],
         ),
         migrations.CreateModel(
-            name="Ingredient",
+            name='Ingredient',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("name", models.CharField(max_length=100)),
-                ("notes", models.TextField()),
-                (
-                    "category",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="ingredients",
-                        to="ingredients.Category",
-                    ),
-                ),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=100)),
+                ('notes', models.TextField()),
+                ('category', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='ingredients', to='ingredients.Category')),
             ],
         ),
     ]
diff --git a/examples/cookbook/cookbook/ingredients/migrations/0002_auto_20161104_0050.py b/examples/cookbook/cookbook/ingredients/migrations/0002_auto_20161104_0050.py
index 40c7f2b..359d4fc 100644
--- a/examples/cookbook/cookbook/ingredients/migrations/0002_auto_20161104_0050.py
+++ b/examples/cookbook/cookbook/ingredients/migrations/0002_auto_20161104_0050.py
@@ -7,12 +7,14 @@ from django.db import migrations, models
 
 class Migration(migrations.Migration):
 
-    dependencies = [("ingredients", "0001_initial")]
+    dependencies = [
+        ('ingredients', '0001_initial'),
+    ]
 
     operations = [
         migrations.AlterField(
-            model_name="ingredient",
-            name="notes",
+            model_name='ingredient',
+            name='notes',
             field=models.TextField(blank=True, null=True),
-        )
+        ),
     ]
diff --git a/examples/cookbook/cookbook/recipes/migrations/0001_initial.py b/examples/cookbook/cookbook/recipes/migrations/0001_initial.py
index 9ce12f2..338c71a 100644
--- a/examples/cookbook/cookbook/recipes/migrations/0001_initial.py
+++ b/examples/cookbook/cookbook/recipes/migrations/0001_initial.py
@@ -10,61 +10,27 @@ class Migration(migrations.Migration):
 
     initial = True
 
-    dependencies = [("ingredients", "0001_initial")]
+    dependencies = [
+        ('ingredients', '0001_initial'),
+    ]
 
     operations = [
         migrations.CreateModel(
-            name="Recipe",
+            name='Recipe',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("title", models.CharField(max_length=100)),
-                ("instructions", models.TextField()),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('title', models.CharField(max_length=100)),
+                ('instructions', models.TextField()),
             ],
         ),
         migrations.CreateModel(
-            name="RecipeIngredient",
+            name='RecipeIngredient',
             fields=[
-                (
-                    "id",
-                    models.AutoField(
-                        auto_created=True,
-                        primary_key=True,
-                        serialize=False,
-                        verbose_name="ID",
-                    ),
-                ),
-                ("amount", models.FloatField()),
-                (
-                    "unit",
-                    models.CharField(
-                        choices=[("kg", "Kilograms"), ("l", "Litres"), ("", "Units")],
-                        max_length=20,
-                    ),
-                ),
-                (
-                    "ingredient",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="used_by",
-                        to="ingredients.Ingredient",
-                    ),
-                ),
-                (
-                    "recipes",
-                    models.ForeignKey(
-                        on_delete=django.db.models.deletion.CASCADE,
-                        related_name="amounts",
-                        to="recipes.Recipe",
-                    ),
-                ),
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('amount', models.FloatField()),
+                ('unit', models.CharField(choices=[('kg', 'Kilograms'), ('l', 'Litres'), ('', 'Units')], max_length=20)),
+                ('ingredient', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='used_by', to='ingredients.Ingredient')),
+                ('recipes', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='amounts', to='recipes.Recipe')),
             ],
         ),
     ]
diff --git a/examples/cookbook/cookbook/recipes/migrations/0002_auto_20161104_0106.py b/examples/cookbook/cookbook/recipes/migrations/0002_auto_20161104_0106.py
index fb32282..f135392 100644
--- a/examples/cookbook/cookbook/recipes/migrations/0002_auto_20161104_0106.py
+++ b/examples/cookbook/cookbook/recipes/migrations/0002_auto_20161104_0106.py
@@ -7,23 +7,19 @@ from django.db import migrations, models
 
 class Migration(migrations.Migration):
 
-    dependencies = [("recipes", "0001_initial")]
+    dependencies = [
+        ('recipes', '0001_initial'),
+    ]
 
     operations = [
         migrations.RenameField(
-            model_name="recipeingredient", old_name="recipes", new_name="recipe"
+            model_name='recipeingredient',
+            old_name='recipes',
+            new_name='recipe',
         ),
         migrations.AlterField(
-            model_name="recipeingredient",
-            name="unit",
-            field=models.CharField(
-                choices=[
-                    (b"unit", b"Units"),
-                    (b"kg", b"Kilograms"),
-                    (b"l", b"Litres"),
-                    (b"st", b"Shots"),
-                ],
-                max_length=20,
-            ),
+            model_name='recipeingredient',
+            name='unit',
+            field=models.CharField(choices=[(b'unit', b'Units'), (b'kg', b'Kilograms'), (b'l', b'Litres'), (b'st', b'Shots')], max_length=20),
         ),
     ]