diff --git a/todo/models.py b/todo/models.py
index 9c3f6c1..33a0cc7 100644
--- a/todo/models.py
+++ b/todo/models.py
@@ -40,18 +40,13 @@ class LockedAtomicTransaction(Atomic):
         super(LockedAtomicTransaction, self).__enter__()
 
         # Make sure not to lock, when sqlite is used, or you'll run into problems while running tests!!!
-        if (
-            settings.DATABASES[self.using]["ENGINE"]
-            != "django.db.backends.sqlite3"
-        ):
+        if settings.DATABASES[self.using]["ENGINE"] != "django.db.backends.sqlite3":
             cursor = None
             try:
                 cursor = get_connection(self.using).cursor()
                 for model in self.models:
                     cursor.execute(
-                        "LOCK TABLE {table_name}".format(
-                            table_name=model._meta.db_table
-                        )
+                        "LOCK TABLE {table_name}".format(table_name=model._meta.db_table)
                     )
             finally:
                 if cursor and not cursor.closed:
@@ -76,12 +71,8 @@ class TaskList(models.Model):
 
 class BaseTask(models.Model):
     title = models.CharField(max_length=140)
-    task_list = models.ForeignKey(
-        TaskList, on_delete=models.CASCADE, null=True
-    )
-    created_date = models.DateField(
-        default=timezone.now, blank=True, null=True
-    )
+    task_list = models.ForeignKey(TaskList, on_delete=models.CASCADE, null=True)
+    created_date = models.DateField(default=timezone.now, blank=True, null=True)
     due_date = models.DateField(blank=True, null=True)
     completed = models.BooleanField(default=False)
     completed_date = models.DateField(blank=True, null=True)
@@ -147,10 +138,7 @@ class Comment(models.Model):
     """
 
     author = models.ForeignKey(
-        settings.AUTH_USER_MODEL,
-        on_delete=models.CASCADE,
-        blank=True,
-        null=True,
+        settings.AUTH_USER_MODEL, on_delete=models.CASCADE, blank=True, null=True
     )
     task = models.ForeignKey(Task, on_delete=models.CASCADE)
     date = models.DateTimeField(default=datetime.datetime.now)
@@ -175,9 +163,7 @@ class Comment(models.Model):
     def snippet(self):
         body_snippet = textwrap.shorten(self.body, width=35, placeholder="...")
         # Define here rather than in __str__ so we can use it in the admin list_display
-        return "{author} - {snippet}...".format(
-            author=self.author_text, snippet=body_snippet
-        )
+        return "{author} - {snippet}...".format(author=self.author_text, snippet=body_snippet)
 
     def __str__(self):
         return self.snippet
@@ -189,13 +175,9 @@ class Attachment(models.Model):
     """
 
     task = models.ForeignKey(Task, on_delete=models.CASCADE)
-    added_by = models.ForeignKey(
-        settings.AUTH_USER_MODEL, on_delete=models.CASCADE
-    )
+    added_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
     timestamp = models.DateTimeField(default=datetime.datetime.now)
-    file = models.FileField(
-        upload_to=get_attachment_upload_dir, max_length=255
-    )
+    file = models.FileField(upload_to=get_attachment_upload_dir, max_length=255)
 
     def filename(self):
         return os.path.basename(self.file.name)