diff --git a/netbox/utilities/context_processors.py b/netbox/utilities/context_processors.py
index 58c8641ec..dab35e982 100644
--- a/netbox/utilities/context_processors.py
+++ b/netbox/utilities/context_processors.py
@@ -4,6 +4,9 @@ from django.conf import settings as django_settings
 
 
 def settings(request):
+    """
+    Expose Django settings in the template context. Example: {{ settings.DEBUG }}
+    """
     return {
         'settings': django_settings,
     }
diff --git a/netbox/utilities/fields.py b/netbox/utilities/fields.py
index d0a0c2180..34f59fe16 100644
--- a/netbox/utilities/fields.py
+++ b/netbox/utilities/fields.py
@@ -5,7 +5,12 @@ from django.db import models
 
 from .forms import ColorSelect
 
-validate_color = RegexValidator('^[0-9a-f]{6}$', 'Enter a valid hexadecimal RGB color code.', 'invalid')
+
+ColorValidator = RegexValidator(
+    regex='^[0-9a-f]{6}$',
+    message='Enter a valid hexadecimal RGB color code.',
+    code='invalid'
+)
 
 
 class NullableCharField(models.CharField):
@@ -21,7 +26,7 @@ class NullableCharField(models.CharField):
 
 
 class ColorField(models.CharField):
-    default_validators = [validate_color]
+    default_validators = [ColorValidator]
     description = "A hexadecimal RGB color code"
 
     def __init__(self, *args, **kwargs):
diff --git a/netbox/utilities/filters.py b/netbox/utilities/filters.py
index 3e403e676..90cdcd9fc 100644
--- a/netbox/utilities/filters.py
+++ b/netbox/utilities/filters.py
@@ -19,6 +19,9 @@ class NumericInFilter(django_filters.BaseInFilter, django_filters.NumberFilter):
 
 
 class NullableCharFieldFilter(django_filters.CharFilter):
+    """
+    Allow matching on null field values by passing a special string used to signify NULL.
+    """
     null_value = 'NULL'
 
     def filter(self, qs, value):
diff --git a/netbox/utilities/forms.py b/netbox/utilities/forms.py
index 9a4284054..1e6e3c0c4 100644
--- a/netbox/utilities/forms.py
+++ b/netbox/utilities/forms.py
@@ -154,6 +154,9 @@ def add_blank_choice(choices):
 #
 
 class SmallTextarea(forms.Textarea):
+    """
+    Subclass used for rendering a smaller textarea element.
+    """
     pass
 
 
@@ -169,6 +172,9 @@ class ColorSelect(forms.Select):
 
 
 class BulkEditNullBooleanSelect(forms.NullBooleanSelect):
+    """
+    A Select widget for NullBooleanFields
+    """
 
     def __init__(self, *args, **kwargs):
         super(BulkEditNullBooleanSelect, self).__init__(*args, **kwargs)
@@ -448,7 +454,9 @@ class ChainedModelMultipleChoiceField(forms.ModelMultipleChoiceField):
 
 
 class SlugField(forms.SlugField):
-
+    """
+    Extend the built-in SlugField to automatically populate from a field called `name` unless otherwise specified.
+    """
     def __init__(self, slug_source='name', *args, **kwargs):
         label = kwargs.pop('label', "Slug")
         help_text = kwargs.pop('help_text', "URL-friendly unique shorthand")
@@ -558,11 +566,15 @@ class JSONField(_JSONField):
 #
 
 class BootstrapMixin(forms.BaseForm):
-
+    """
+    Add the base Bootstrap CSS classes to form elements.
+    """
     def __init__(self, *args, **kwargs):
         super(BootstrapMixin, self).__init__(*args, **kwargs)
 
-        exempt_widgets = [forms.CheckboxInput, forms.ClearableFileInput, forms.FileInput, forms.RadioSelect]
+        exempt_widgets = [
+            forms.CheckboxInput, forms.ClearableFileInput, forms.FileInput, forms.RadioSelect
+        ]
 
         for field_name, field in self.fields.items():
             if field.widget.__class__ not in exempt_widgets:
@@ -632,14 +644,15 @@ class ComponentForm(BootstrapMixin, forms.Form):
 
 
 class BulkEditForm(forms.Form):
-
+    """
+    Base form for editing multiple objects in bulk
+    """
     def __init__(self, model, parent_obj=None, *args, **kwargs):
         super(BulkEditForm, self).__init__(*args, **kwargs)
         self.model = model
         self.parent_obj = parent_obj
+        self.nullable_fields = []
 
         # Copy any nullable fields defined in Meta
         if hasattr(self.Meta, 'nullable_fields'):
-            self.nullable_fields = [field for field in self.Meta.nullable_fields]
-        else:
-            self.nullable_fields = []
+            self.nullable_fields = self.Meta.nullable_fields
diff --git a/netbox/utilities/tables.py b/netbox/utilities/tables.py
index a9f1044d6..e531b5e32 100644
--- a/netbox/utilities/tables.py
+++ b/netbox/utilities/tables.py
@@ -22,7 +22,9 @@ class BaseTable(tables.Table):
 
 
 class ToggleColumn(tables.CheckBoxColumn):
-
+    """
+    Extend CheckBoxColumn to add a "toggle all" checkbox in the column header.
+    """
     def __init__(self, *args, **kwargs):
         default = kwargs.pop('default', '')
         visible = kwargs.pop('visible', False)
diff --git a/netbox/utilities/testing.py b/netbox/utilities/testing.py
index d40202842..fa38166e0 100644
--- a/netbox/utilities/testing.py
+++ b/netbox/utilities/testing.py
@@ -5,7 +5,6 @@ class HttpStatusMixin(object):
     """
     Custom mixin to provide more detail in the event of an unexpected HTTP response.
     """
-
     def assertHttpStatus(self, response, expected_status):
         err_message = "Expected HTTP status {}; received {}: {}"
         self.assertEqual(response.status_code, expected_status, err_message.format(
diff --git a/netbox/utilities/validators.py b/netbox/utilities/validators.py
index dcdb9bc6d..102e368a5 100644
--- a/netbox/utilities/validators.py
+++ b/netbox/utilities/validators.py
@@ -9,7 +9,6 @@ class EnhancedURLValidator(URLValidator):
     """
     Extends Django's built-in URLValidator to permit the use of hostnames with no domain extension.
     """
-
     class AnyURLScheme(object):
         """
         A fake URL list which "contains" all scheme names abiding by the syntax defined in RFC 3986 section 3.1