pep guidelines

bookshelf/models.py

 from django.db import models
+from django.urls import reverse
 
 # Create your models here.
 
@@ -13,6 +14,7 @@ class Author(models.Model):
     def __str__(self):
         return str(self.first_name + ' ' + self.last_name)
 
+
 class Books(models.Model):
     title = models.CharField(max_length=255, null=True, blank=True)
     author = models.ForeignKey(Author, related_name='books', on_delete=models.CASCADE, null=True)