Codestyle fixes (flake8)

This also adds the flake8 dependencies to the test extras for
installation.

src/wagtail_personalisation/rules.py

@@ -36,10 +36,10 @@ class AbstractBaseRule(models.Model):
     def description(self):
         """Return a description explaining the functionality of the rule.
         Used in the segmentation dashboard.
-        
+
         :returns: A dict containing a title and a value
         :rtype: dict
-        
+
         """
         description = {
             'title': _('Abstract segmentation rule'),
@@ -55,10 +55,10 @@ class AbstractBaseRule(models.Model):
 @python_2_unicode_compatible
 class TimeRule(AbstractBaseRule):
     """Time rule to segment users based on a start and end time.
-    
+
     Matches when the time a request is made falls between the
     set start time and end time.
-    
+
     """
     start_time = models.TimeField(_("Starting time"))
     end_time = models.TimeField(_("Ending time"))
@@ -98,10 +98,10 @@ class TimeRule(AbstractBaseRule):
 @python_2_unicode_compatible
 class DayRule(AbstractBaseRule):
     """Day rule to segment users based on the day(s) of a visit.
-    
+
     Matches when the day a request is made matches with the days
     set in the rule.
-    
+
     """
     mon = models.BooleanField(_("Monday"), default=False)
     tue = models.BooleanField(_("Tuesday"), default=False)
@@ -159,10 +159,10 @@ class DayRule(AbstractBaseRule):
 @python_2_unicode_compatible
 class ReferralRule(AbstractBaseRule):
     """Referral rule to segment users based on a regex test.
-    
+
     Matches when the referral header in a request matches with
     the set regex test.
-    
+
     """
     regex_string = models.TextField(
         _("Regex string to match the referer with"))
@@ -202,10 +202,10 @@ class ReferralRule(AbstractBaseRule):
 class VisitCountRule(AbstractBaseRule):
     """Visit count rule to segment users based on amount of visits to a
     specified page.
-    
+
     Matches when the operator and count validate True
     when visiting the set page.
-    
+
     """
     OPERATOR_CHOICES = (
         ('more_than', _("More than")),
@@ -241,13 +241,13 @@ class VisitCountRule(AbstractBaseRule):
         def get_visit_count(request):
             """Search through the request sessions to get the page visit count
             corresponding to the request.
-            
+
             :param request: The http request
             :type request: django.http.HttpRequest
             :returns: A number indicating the amount of visits
                       to the requested page
             :rtype: int
-            
+
             """
             for page in request.session['visit_count']:
                 if page['path'] == request.path:
@@ -286,10 +286,10 @@ class VisitCountRule(AbstractBaseRule):
 @python_2_unicode_compatible
 class QueryRule(AbstractBaseRule):
     """Query rule to segment users based on matching queries.
-    
+
     Matches when both the set parameter and value match with one
     present in the request query.
-    
+
     """
     parameter = models.SlugField(_("The query parameter to search for"),
                                  max_length=20)
@@ -332,10 +332,10 @@ class QueryRule(AbstractBaseRule):
 @python_2_unicode_compatible
 class DeviceRule(AbstractBaseRule):
     """Device rule to segment users based on matching devices.
-    
+
     Matches when the set device type matches with the one present
     in the request user agent headers.
-    
+
     """
     mobile = models.BooleanField(_("Mobile phone"), default=False)
     tablet = models.BooleanField(_("Tablet"), default=False)
@@ -371,9 +371,9 @@ class DeviceRule(AbstractBaseRule):
 class UserIsLoggedInRule(AbstractBaseRule):
     """User is logged in rule to segment users based on their authentication
     status.
-    
+
     Matches when the user is authenticated.
-    
+
     """
     is_logged_in = models.BooleanField(default=False)