diff --git a/.flake8 b/.flake8
index be5d5515c8..fdbeb86a5a 100644
--- a/.flake8
+++ b/.flake8
@@ -1,6 +1,6 @@
 [flake8]
 max-line-length = 120
-application-import-names = dmoj,judge,django_ace
+application-import-names = dmoj,judge,django_ace,martor
 import-order-style = pycharm
 enable-extensions = G
 ignore =
@@ -18,6 +18,9 @@ per-file-ignores =
     ./judge/management/commands/runmoss.py:F403,F405
     # E501: line too long, ignore in migrations
     ./judge/migrations/*.py:E501
+    # E501: line too long, ignore in martor emoji and mention extensions
+    ./martor/extensions/emoji.py:E501
+    ./martor/extensions/mention.py:E501
 exclude =
     # belongs to the user
     ./dmoj/local_settings.py,
diff --git a/dmoj/urls.py b/dmoj/urls.py
index 32976e10dc..5852a0094b 100644
--- a/dmoj/urls.py
+++ b/dmoj/urls.py
@@ -8,7 +8,6 @@
 from django.utils.functional import lazy
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import RedirectView
-from martor.views import markdown_search_user
 
 from judge.feed import AtomBlogFeed, AtomCommentFeed, AtomProblemFeed, BlogFeed, CommentFeed, ProblemFeed
 from judge.sitemap import sitemaps
@@ -22,6 +21,7 @@
     ContestUserSearchSelect2View, OrganizationSelect2View, ProblemSelect2View, TicketUserSelect2View, \
     UserSearchSelect2View, UserSelect2View
 from judge.views.widgets import martor_image_uploader
+from martor.views import markdown_search_user
 
 admin.autodiscover()
 
diff --git a/martor/admin.py b/martor/admin.py
index 2e041b75eb..1046adeec9 100644
--- a/martor/admin.py
+++ b/martor/admin.py
@@ -1,12 +1,11 @@
 from django.contrib import admin
-from django.db import models
 
-from .widgets import AdminMartorWidget
 from .models import MartorField
+from .widgets import AdminMartorWidget
 
 
 class MartorModelAdmin(admin.ModelAdmin):
 
     formfield_overrides = {
-        MartorField: {'widget': AdminMartorWidget}
+        MartorField: {'widget': AdminMartorWidget},
     }
diff --git a/martor/api.py b/martor/api.py
index 2f0b2964e1..c0e12eac6a 100644
--- a/martor/api.py
+++ b/martor/api.py
@@ -1,7 +1,10 @@
-import json
 import base64
+import json
+
+
 import requests
-from .settings import (MARTOR_IMGUR_CLIENT_ID, MARTOR_IMGUR_API_KEY)
+
+from .settings import MARTOR_IMGUR_API_KEY, MARTOR_IMGUR_CLIENT_ID
 
 requests.packages.urllib3.disable_warnings()
 
@@ -24,8 +27,8 @@ def imgur_uploader(image):
             'key': MARTOR_IMGUR_API_KEY,
             'image': base64.b64encode(image.read()),
             'type': 'base64',
-            'name': image.name
-        }
+            'name': image.name,
+        },
     )
 
     """
@@ -40,15 +43,15 @@ def imgur_uploader(image):
         return json.dumps({
             'status': respdata['status'],
             'link': respdata['data']['link'],
-            'name': respdata['data']['name']
+            'name': respdata['data']['name'],
         })
     elif response.status_code == 415:
         # Unsupport File type
         return json.dumps({
             'status': response.status_code,
-            'error': response.reason
+            'error': response.reason,
         })
     return json.dumps({
         'status': response.status_code,
-        'error': response.content.decode('utf-8')
+        'error': response.content.decode('utf-8'),
     })
diff --git a/martor/extensions/del_ins.py b/martor/extensions/del_ins.py
index 14db77552f..5cb930e2cd 100644
--- a/martor/extensions/del_ins.py
+++ b/martor/extensions/del_ins.py
@@ -31,8 +31,8 @@
 from markdown.inlinepatterns import SimpleTagPattern
 
 
-DEL_RE = r"(\~\~)(.+?)(\~\~)"
-INS_RE = r"(\+\+)(.+?)(\+\+)"
+DEL_RE = r'(\~\~)(.+?)(\~\~)'
+INS_RE = r'(\+\+)(.+?)(\+\+)'
 
 
 class DelInsExtension(markdown.extensions.Extension):
@@ -49,6 +49,6 @@ def makeExtension(*args, **kwargs):
     return DelInsExtension(*args, **kwargs)
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     import doctest
     doctest.testmod()
diff --git a/martor/extensions/emoji.py b/martor/extensions/emoji.py
index 238c304af8..7706b975c5 100644
--- a/martor/extensions/emoji.py
+++ b/martor/extensions/emoji.py
@@ -99,7 +99,7 @@ def handleMatch(self, m):
         if emoji not in EMOJIS:
             return emoji
         url = '{0}{1}.png'.format(
-            MARTOR_MARKDOWN_BASE_EMOJI_URL, emoji.replace(':', '')
+            MARTOR_MARKDOWN_BASE_EMOJI_URL, emoji.replace(':', ''),
         )
         if MARTOR_MARKDOWN_BASE_EMOJI_USE_STATIC is True:
             url = static(url)
@@ -121,6 +121,6 @@ def makeExtension(*args, **kwargs):
     return EmojiExtension(*args, **kwargs)
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     import doctest
     doctest.testmod()
diff --git a/martor/extensions/mdx_video.py b/martor/extensions/mdx_video.py
index 52518df743..a8f965dc35 100644
--- a/martor/extensions/mdx_video.py
+++ b/martor/extensions/mdx_video.py
@@ -30,7 +30,7 @@ def add_inline(self, md, name, klass, re):
         pattern = klass(re)
         pattern.md = md
         pattern.ext = self
-        md.inlinePatterns.add(name, pattern, "<reference")
+        md.inlinePatterns.add(name, pattern, '<reference')
 
     def extendMarkdown(self, md, md_globals):
         self.add_inline(md, 'dailymotion', Dailymotion,
@@ -134,6 +134,6 @@ def makeExtension(**kwargs):
     return VideoExtension(**kwargs)
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     import doctest
     doctest.testmod()
diff --git a/martor/extensions/mention.py b/martor/extensions/mention.py
index 2e74ab6f9a..f1503d1dfb 100644
--- a/martor/extensions/mention.py
+++ b/martor/extensions/mention.py
@@ -1,8 +1,9 @@
 import markdown
 from django.contrib.auth import get_user_model
+
 from ..settings import (
     MARTOR_ENABLE_CONFIGS,
-    MARTOR_MARKDOWN_BASE_MENTION_URL
+    MARTOR_MARKDOWN_BASE_MENTION_URL,
 )
 
 """
@@ -46,6 +47,7 @@ def extendMarkdown(self, md, md_globals):
 def makeExtension(*args, **kwargs):
     return MentionExtension(*args, **kwargs)
 
-if __name__ == "__main__":
+
+if __name__ == '__main__':
     import doctest
     doctest.testmod()
diff --git a/martor/extensions/urlize.py b/martor/extensions/urlize.py
index 8c0d3347b3..5833896199 100644
--- a/martor/extensions/urlize.py
+++ b/martor/extensions/urlize.py
@@ -61,12 +61,12 @@ def handleMatch(self, m):
         text = url
 
         if not url.split('://')[0] in ('http', 'https', 'ftp'):
-            if '@' in url and not '/' in url:
+            if '@' in url and '/' not in url:
                 url = 'mailto:' + url
             else:
                 url = 'http://' + url
 
-        el = markdown.util.etree.Element("a")
+        el = markdown.util.etree.Element('a')
         el.set('href', url)
         el.text = markdown.util.AtomicString(text)
         return el
@@ -83,6 +83,7 @@ def extendMarkdown(self, md, md_globals):
 def makeExtension(*args, **kwargs):
     return UrlizeExtension(*args, **kwargs)
 
-if __name__ == "__main__":
+
+if __name__ == '__main__':
     import doctest
     doctest.testmod()
diff --git a/martor/fields.py b/martor/fields.py
index 9d2695e682..f7b64c0c93 100644
--- a/martor/fields.py
+++ b/martor/fields.py
@@ -1,7 +1,8 @@
 from django import forms
 
+
 from .settings import MARTOR_ENABLE_LABEL
-from .widgets import (MartorWidget, AdminMartorWidget)
+from .widgets import MartorWidget
 
 
 class MartorFormField(forms.CharField):
diff --git a/martor/settings.py b/martor/settings.py
index b5eab75804..456fb809c7 100644
--- a/martor/settings.py
+++ b/martor/settings.py
@@ -11,33 +11,33 @@
         'living': 'false',      # to enable/disable live updates in preview
         'spellcheck': 'false',  # to enable/disable spellcheck in form textareas
         'hljs': 'true',         # to enable/disable hljs highlighting in preview
-    }
+    },
 )
 
 # To setup the martor editor with label or not (default is False)
 MARTOR_ENABLE_LABEL = getattr(
-    settings, 'MARTOR_ENABLE_LABEL', False
+    settings, 'MARTOR_ENABLE_LABEL', False,
 )
 
 # Imgur API Keys
 MARTOR_IMGUR_CLIENT_ID = getattr(
-    settings, 'MARTOR_IMGUR_CLIENT_ID', ''
+    settings, 'MARTOR_IMGUR_CLIENT_ID', '',
 )
 MARTOR_IMGUR_API_KEY = getattr(
-    settings, 'MARTOR_IMGUR_API_KEY', ''
+    settings, 'MARTOR_IMGUR_API_KEY', '',
 )
 
 # Safe Mode
 MARTOR_MARKDOWN_SAFE_MODE = getattr(
-    settings, 'MARTOR_MARKDOWN_SAFE_MODE', True
+    settings, 'MARTOR_MARKDOWN_SAFE_MODE', True,
 )
 
 # Markdownify
 MARTOR_MARKDOWNIFY_FUNCTION = getattr(
-    settings, 'MARTOR_MARKDOWNIFY_FUNCTION', 'martor.utils.markdownify'
+    settings, 'MARTOR_MARKDOWNIFY_FUNCTION', 'martor.utils.markdownify',
 )
 MARTOR_MARKDOWNIFY_URL = getattr(
-    settings, 'MARTOR_MARKDOWNIFY_URL', '/martor/markdownify/'
+    settings, 'MARTOR_MARKDOWNIFY_URL', '/martor/markdownify/',
 )
 
 # Markdown extensions
@@ -54,30 +54,30 @@
         'martor.extensions.mention',    # to parse markdown mention
         'martor.extensions.emoji',      # to parse markdown emoji
         'martor.extensions.mdx_video',  # to parse embed/iframe video
-    ]
+    ],
 )
 
 # Markdown Extensions Configs
 MARTOR_MARKDOWN_EXTENSION_CONFIGS = getattr(
-    settings, 'MARTOR_MARKDOWN_EXTENSION_CONFIGS', {}
+    settings, 'MARTOR_MARKDOWN_EXTENSION_CONFIGS', {},
 )
 
 # Markdown urls
 MARTOR_UPLOAD_URL = getattr(
-    settings, 'MARTOR_UPLOAD_URL', '/martor/uploader/'  # for imgur
+    settings, 'MARTOR_UPLOAD_URL', '/martor/uploader/',  # for imgur
 )
 MARTOR_SEARCH_USERS_URL = getattr(
-    settings, 'MARTOR_SEARCH_USERS_URL', '/martor/search-user/'  # for mention
+    settings, 'MARTOR_SEARCH_USERS_URL', '/martor/search-user/',  # for mention
 )
 
 # Markdown Extensions
 MARTOR_MARKDOWN_BASE_EMOJI_URL = getattr(
-    settings, 'MARTOR_MARKDOWN_BASE_EMOJI_URL', 'https://github.githubassets.com/images/icons/emoji/'
+    settings, 'MARTOR_MARKDOWN_BASE_EMOJI_URL', 'https://github.githubassets.com/images/icons/emoji/',
 )
 # to use static and keep backward compatibility
 # set to true if using bucket like storage engine
 MARTOR_MARKDOWN_BASE_EMOJI_USE_STATIC = getattr(
     settings, 'MARTOR_MARKDOWN_BASE_EMOJI_USE_STATIC', False)
 MARTOR_MARKDOWN_BASE_MENTION_URL = getattr(
-    settings, 'MARTOR_MARKDOWN_BASE_MENTION_URL', 'https://python.web.id/author/'
+    settings, 'MARTOR_MARKDOWN_BASE_MENTION_URL', 'https://python.web.id/author/',
 )
diff --git a/martor/tests/models.py b/martor/tests/models.py
index b5fc75356f..1c848c97e7 100644
--- a/martor/tests/models.py
+++ b/martor/tests/models.py
@@ -1,4 +1,3 @@
-
 from django.db import models
 
 from martor.models import MartorField
diff --git a/martor/urls.py b/martor/urls.py
index 3ae3fc023b..cd5f185f05 100644
--- a/martor/urls.py
+++ b/martor/urls.py
@@ -1,7 +1,8 @@
 import django
-from .views import (markdownfy_view,
-                    markdown_imgur_uploader,
-                    markdown_search_user)
+
+from .views import (markdown_imgur_uploader,
+                    markdown_search_user,
+                    markdownfy_view)
 
 
 if django.VERSION >= (2, 0):
diff --git a/martor/utils.py b/martor/utils.py
index 49cb131f7f..859026e887 100644
--- a/martor/utils.py
+++ b/martor/utils.py
@@ -1,12 +1,12 @@
-from django.utils.functional import Promise
-from django.utils.encoding import force_str
+import markdown
 from django.core.serializers.json import DjangoJSONEncoder
+from django.utils.encoding import force_str
+from django.utils.functional import Promise
 
-import markdown
 from .settings import (
-    MARTOR_MARKDOWN_SAFE_MODE,
     MARTOR_MARKDOWN_EXTENSIONS,
-    MARTOR_MARKDOWN_EXTENSION_CONFIGS
+    MARTOR_MARKDOWN_EXTENSION_CONFIGS,
+    MARTOR_MARKDOWN_SAFE_MODE,
 )
 
 
@@ -30,11 +30,11 @@ def markdownify(markdown_content):
             markdown_content,
             safe_mode=MARTOR_MARKDOWN_SAFE_MODE,
             extensions=MARTOR_MARKDOWN_EXTENSIONS,
-            extension_configs=MARTOR_MARKDOWN_EXTENSION_CONFIGS
+            extension_configs=MARTOR_MARKDOWN_EXTENSION_CONFIGS,
         )
     except Exception:
         raise VersionNotCompatible("The markdown isn't compatible, please reinstall "
-                                   "your python markdown into Markdown>=3.0")
+                                   'your python markdown into Markdown>=3.0')
 
 
 class LazyEncoder(DjangoJSONEncoder):
diff --git a/martor/views.py b/martor/views.py
index de3d68e9a0..fce7b48d90 100644
--- a/martor/views.py
+++ b/martor/views.py
@@ -1,10 +1,11 @@
 import json
-from django.http import HttpResponse
-from django.utils.module_loading import import_string
-from django.utils.translation import gettext_lazy as _
+
 from django.contrib.auth.decorators import login_required
 from django.contrib.auth.models import User
 from django.db.models import Q
+from django.http import HttpResponse
+from django.utils.module_loading import import_string
+from django.utils.translation import gettext_lazy as _
 
 from .api import imgur_uploader
 from .settings import MARTOR_MARKDOWNIFY_FUNCTION
@@ -60,12 +61,12 @@ def markdown_search_user(request):
             and username != '' \
             and ' ' not in username:
         users = User.objects.filter(
-            Q(username__icontains=username)
+            Q(username__icontains=username),
         ).filter(is_active=True)
         if users.exists():
             data.update({
                 'status': 200,
-                'data': [{'username': u.username} for u in users]
+                'data': [{'username': u.username} for u in users],
             })
             return HttpResponse(
                 json.dumps(data, cls=LazyEncoder),
@@ -73,12 +74,12 @@ def markdown_search_user(request):
         data.update({
             'status': 204,
             'error': _('No users registered as `%(username)s` '
-                       'or user is unactived.') % {'username': username}
+                       'or user is unactived.') % {'username': username},
         })
     else:
         data.update({
             'status': 204,
-            'error': _('Validation Failed for field `username`')
+            'error': _('Validation Failed for field `username`'),
         })
     return HttpResponse(
         json.dumps(data, cls=LazyEncoder),
diff --git a/martor/widgets.py b/martor/widgets.py
index 531ef4f3ff..c90c279fb5 100644
--- a/martor/widgets.py
+++ b/martor/widgets.py
@@ -1,13 +1,13 @@
 from django import forms
-from django.template.loader import get_template
 from django.contrib.admin import widgets
+from django.template.loader import get_template
 
 from .settings import (
     MARTOR_ENABLE_CONFIGS,
-    MARTOR_UPLOAD_URL,
     MARTOR_MARKDOWNIFY_URL,
+    MARTOR_MARKDOWN_BASE_EMOJI_URL,
     MARTOR_SEARCH_USERS_URL,
-    MARTOR_MARKDOWN_BASE_EMOJI_URL
+    MARTOR_UPLOAD_URL,
 )
 
 
@@ -21,7 +21,7 @@ def render(self, name, value, attrs=None, renderer=None, **kwargs):
             'data-upload-url': MARTOR_UPLOAD_URL,
             'data-markdownfy-url': MARTOR_MARKDOWNIFY_URL,
             'data-search-users-url': MARTOR_SEARCH_USERS_URL,
-            'data-base-emoji-url': MARTOR_MARKDOWN_BASE_EMOJI_URL
+            'data-base-emoji-url': MARTOR_MARKDOWN_BASE_EMOJI_URL,
         }
 
         # Make sure that the martor value is in the class attr passed in
@@ -58,7 +58,7 @@ class Media:
                 'plugins/css/ace.min.css',
                 'plugins/css/semantic.css',
                 'plugins/css/resizable.min.css',
-            )
+            ),
         }
         js = (
             'plugins/js/ace.js',