diff --git a/beat/web/backend/models/environment.py b/beat/web/backend/models/environment.py
index 7233b79201caf2ca1f14e49ba7f1f308509d975c..e42694647a215f392b7c42202900382646f0c07a 100755
--- a/beat/web/backend/models/environment.py
+++ b/beat/web/backend/models/environment.py
@@ -34,112 +34,87 @@ from ...common.models import ShareableManager
 from ...common.texts import Messages
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class EnvironmentManager(ShareableManager):
-
     def get_by_natural_key(self, name, version):
         return self.get(name=name, version=version)
 
     def get_by_fullname(self, fullname):
-        name, version = fullname.rsplit(' ', 1)
+        name, version = fullname.rsplit(" ", 1)
         return self.get_by_natural_key(name, version[1:-1])
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class Environment(Shareable):
     """Defines a software environment to run algorithms"""
 
-    name = models.CharField(
-        max_length=200,
-        help_text=Messages['name'],
-    )
+    name = models.CharField(max_length=200, help_text=Messages["name"])
 
     version = models.CharField(
         max_length=20,
-        help_text='Free-style version for this environment (normally read from the Worker/Scheduler available environments)',
+        help_text="Free-style version for this environment (normally read from the Worker/Scheduler available environments)",
     )
 
     short_description = models.CharField(
-        max_length=100,
-        default='',
-        blank=True,
-        help_text=Messages['short_description'],
+        max_length=100, default="", blank=True, help_text=Messages["short_description"]
     )
 
     description = models.TextField(
-        default='',
-        blank=True,
-        help_text=Messages['description'],
+        default="", blank=True, help_text=Messages["description"]
     )
 
-    creation_date = models.DateTimeField(
-        'Creation date',
-        auto_now_add = True,
-    )
+    creation_date = models.DateTimeField("Creation date", auto_now_add=True)
 
     active = models.BooleanField(
-        default=True,
-        help_text='If this environment can be used in experiments',
+        default=True, help_text="If this environment can be used in experiments"
     )
 
     previous_version = models.ForeignKey(
-        'self',
-        related_name='next_versions',
+        "self",
+        related_name="next_versions",
         null=True,
         blank=True,
         on_delete=models.SET_NULL,
     )
 
-
     objects = EnvironmentManager()
 
-
-    #_____ Meta parameters __________
+    # _____ Meta parameters __________
 
     class Meta:
-        unique_together = ('name', 'version')
-
+        unique_together = ("name", "version")
 
-    #_____ Overrides __________
+    # _____ Overrides __________
 
     def __str__(self):
         return self.fullname()
 
-
     def natural_key(self):
         return (self.name, self.version)
 
-
-    #_____ Utilities __________
+    # _____ Utilities __________
 
     def fullname(self):
-        return '%s (%s)' % (self.name, self.version)
-
+        return "%s (%s)" % (self.name, self.version)
 
     def get_absolute_url(self):
-        return reverse(
-            'backend:view-environment',
-            args=(self.name, self.version,),
-        )
-
+        return reverse("backend:view-environment", args=(self.name, self.version))
 
     def get_admin_change_url(self):
-        return reverse('admin:backend_environment_change', args=(self.id,))
-
+        return reverse("admin:backend_environment_change", args=(self.id,))
 
     def queues_for(self, user):
         """Returns all queues associated to this environment for which the user
         has the 'can_access' permission"""
 
-        return [q for q in self.queues.all() if user.has_perm('backend.can_access', q)]
-
+        return [q for q in self.queues.all() if user.has_perm("backend.can_access", q)]
 
     def as_dict(self):
-        '''Returns a representation as a dictionary'''
+        """Returns a representation as a dictionary"""
 
         return dict(
             name=self.name,
@@ -149,12 +124,13 @@ class Environment(Shareable):
         )
 
 
-#----------------------------------------------------------
+# ----------------------------------------------------------
 
 
 class EnvironmentLanguage(models.Model):
 
-    environment = models.ForeignKey(Environment, related_name='languages')
+    environment = models.ForeignKey(Environment, related_name="languages")
 
-    language = models.CharField(max_length=1, choices=Code.CODE_LANGUAGE,
-                                default=Code.PYTHON)
+    language = models.CharField(
+        max_length=1, choices=Code.CODE_LANGUAGE, default=Code.PYTHON
+    )