fix flake8

backend/metagenedb/apps/catalog/factory/gene.py

 from factory import (
-    Faker, RelatedFactory, SubFactory, fuzzy
+    Faker, RelatedFactory, SubFactory
 )
 from factory.django import DjangoModelFactory
 

backend/metagenedb/apps/catalog/models/source.py

@@ -11,7 +11,7 @@ class Source(models.Model):
     tools = models.JSONField(blank=True, null=True)
 
     def save(self, *args, **kwargs):
-        self.slug=slugify(self.name)
+        self.slug = slugify(self.name)
         super(Source, self).save(*args, **kwargs)
 
     def __str__(self):