diff --git a/app.py b/app.py
index 31f782d..167fa07 100644
--- a/app.py
+++ b/app.py
@@ -4,9 +4,9 @@ from sqlalchemy import MetaData, event
 from sqlalchemy.engine import Engine
 from flask_migrate import Migrate
 import version
-from lib import cachebust
+from lib.cachebust import cachebust
 from flask_limiter import Limiter
-from lib import get_viewer
+from lib.session import get_viewer
 import os
 import mimetypes
 
diff --git a/dodo.py b/dodo.py
index 916633a..05fcd84 100644
--- a/dodo.py
+++ b/dodo.py
@@ -7,44 +7,46 @@ def reltouch(source_filename, dest_filename):
     utime(dest_filename, ns=(stat_res.st_atime_ns, stat_res.st_mtime_ns))
 
 
-def resize_image(basename, width, format):
+def resize_image(basename, width, image_format):
     from PIL import Image
     with Image.open('assets/{}.png'.format(basename)) as im:
-        if 'A' in im.getbands() and format != 'jpeg':
+        if 'A' in im.getbands() and image_format != 'jpeg':
             im = im.convert('RGBA')
         else:
             im = im.convert('RGB')
         height = im.height * width // im.width
         new = im.resize((width, height), resample=Image.LANCZOS)
-        if format == 'jpeg':
+        if image_format == 'jpeg':
             kwargs = dict(
                     optimize=True,
                     progressive=True,
                     quality=80,
                     )
-        elif format == 'webp':
+        elif image_format == 'webp':
             kwargs = dict(
                     quality=79,
                     )
-        elif format == 'png':
+        elif image_format == 'png':
             kwargs = dict(
                     optimize=True,
                     )
-        new.save('static/{}-{}.{}'.format(basename, width, format), **kwargs)
+        new.save('static/{}-{}.{}'.format(basename, width, image_format),
+                 **kwargs)
         reltouch('assets/{}.png'.format(basename),
-                 'static/{}-{}.{}'.format(basename, width, format))
+                 'static/{}-{}.{}'.format(basename, width, image_format))
 
 
 def task_logotype():
     """resize and convert logotype"""
     widths = (200, 400, 600, 800)
-    formats = ('jpeg', 'webp')
+    image_formats = ('jpeg', 'webp')
     for width in widths:
-        for format in formats:
+        for image_format in image_formats:
             yield dict(
-                    name='{}.{}'.format(width, format),
-                    actions=[(resize_image, ('logotype', width, format))],
-                    targets=[f'static/logotype-{width}.{format}'],
+                    name='{}.{}'.format(width, image_format),
+                    actions=[(resize_image,
+                              ('logotype', width, image_format))],
+                    targets=[f'static/logotype-{width}.{image_format}'],
                     file_dep=['assets/logotype.png'],
                     clean=True,
                 )
@@ -55,13 +57,14 @@ def task_service_icon():
     widths = (20, 40, 80)
     formats = ('webp', 'png')
     for width in widths:
-        for format in formats:
+        for image_format in formats:
             for basename in ('twitter', 'mastodon'):
                 yield dict(
-                    name='{}-{}.{}'.format(basename, width, format),
-                    actions=[(resize_image, (basename, width, format))],
+                    name='{}-{}.{}'.format(basename, width, image_format),
+                    actions=[(resize_image, (basename, width, image_format))],
                     targets=[
-                        'static/{}-{}.{}'.format(basename, width, format)],
+                        'static/{}-{}.{}'.format(basename, width,
+                                                 image_format)],
                     file_dep=['assets/{}.png'.format(basename)],
                     clean=True,
                 )
diff --git a/lib/__init__.py b/lib/__init__.py
index 2dbc7bc..e69de29 100644
--- a/lib/__init__.py
+++ b/lib/__init__.py
@@ -1,10 +0,0 @@
-from .interval import decompose_interval
-from .interval import SCALES as interval_scales
-from .cachebust import cachebust
-from .session import set_session_cookie, get_viewer_session, get_viewer
-from . import auth
-from . import brotli
-from . import cachebust
-from . import interval
-from . import session
-from . import settings
diff --git a/lib/brotli.py b/lib/brotli.py
index 5cabf08..84498bc 100644
--- a/lib/brotli.py
+++ b/lib/brotli.py
@@ -8,7 +8,9 @@ import mimetypes
 
 
 class BrotliCache(object):
-    def __init__(self, redis_kwargs={}, max_wait=0.020, expire=60*60*6):
+    def __init__(self, redis_kwargs=None, max_wait=0.020, expire=60*60*6):
+        if not redis_kwargs:
+            redis_kwargs = {}
         self.redis = redis.StrictRedis(**redis_kwargs)
         self.max_wait = max_wait
         self.expire = expire
diff --git a/lib/cachebust.py b/lib/cachebust.py
index aff4262..47e7860 100644
--- a/lib/cachebust.py
+++ b/lib/cachebust.py
@@ -3,6 +3,8 @@ import os
 
 
 def cachebust(app):
+    # pylint: disable=unused-variable
+
     @app.route('/static-cb/<int:timestamp>/<path:filename>')
     def static_cachebust(timestamp, filename):
         path = os.path.join(app.static_folder, filename)
diff --git a/lib/interval.py b/lib/interval.py
index a64b956..69e38a3 100644
--- a/lib/interval.py
+++ b/lib/interval.py
@@ -24,7 +24,7 @@ def decompose_interval(attrname):
 
         @scale.setter
         def scale(self, value):
-            if(type(value) != timedelta):
+            if not isinstance(value, timedelta):
                 value = timedelta(seconds=float(value))
             setattr(self, attrname, max(1, getattr(self, sig_name)) * value)
 
@@ -34,7 +34,7 @@ def decompose_interval(attrname):
 
         @significand.setter
         def significand(self, value):
-            if type(value) == str and value.strip() == '':
+            if isinstance(value, str) and value.strip() == '':
                 value = 0
 
             try:
diff --git a/model.py b/model.py
index cf32a7e..c02348c 100644
--- a/model.py
+++ b/model.py
@@ -2,7 +2,7 @@ from datetime import timedelta, datetime
 
 from app import db
 import secrets
-from lib import decompose_interval
+from lib.interval import decompose_interval
 
 
 class TimestampMixin(object):
@@ -33,8 +33,8 @@ class RemoteIDMixin(object):
         return self.id.split(":")[1]
 
     @twitter_id.setter
-    def twitter_id(self, id):
-        self.id = "twitter:{}".format(id)
+    def twitter_id(self, id_):
+        self.id = "twitter:{}".format(id_)
 
     @property
     def mastodon_instance(self):
@@ -61,8 +61,8 @@ class RemoteIDMixin(object):
         return self.id.split(":", 1)[1].split('@')[0]
 
     @mastodon_id.setter
-    def mastodon_id(self, id):
-        self.id = "mastodon:{}@{}".format(id, self.mastodon_instance)
+    def mastodon_id(self, id_):
+        self.id = "mastodon:{}@{}".format(id_, self.mastodon_instance)
 
 
 @decompose_interval('policy_delete_every')
@@ -121,9 +121,10 @@ class Account(TimestampMixin, RemoteIDMixin):
             self.next_delete = datetime.now() + value
         return value
 
+    # pylint: disable=R0201
     @db.validates('policy_keep_latest')
     def validate_empty_string_is_zero(self, key, value):
-        if type(value) == str and value.strip() == '':
+        if isinstance(value, str) and value.strip() == '':
             return 0
         return value
 
diff --git a/routes.py b/routes.py
index 58325a2..a2c5444 100644
--- a/routes.py
+++ b/routes.py
@@ -3,10 +3,8 @@ from flask import render_template, url_for, redirect, request, g, Response,\
 from datetime import datetime, timedelta
 import lib.twitter
 import lib.mastodon
-import lib
 from lib.auth import require_auth, require_auth_api, csrf
-from lib import set_session_cookie
-from lib import get_viewer_session, get_viewer
+from lib.session import set_session_cookie, get_viewer_session, get_viewer
 from model import Session, TwitterArchive, MastodonApp, MastodonInstance
 from app import app, db, sentry, limiter
 import tasks
@@ -15,6 +13,7 @@ from twitter import TwitterError
 from urllib.error import URLError
 import version
 import lib.version
+import lib.brotli
 
 
 @app.before_request
diff --git a/tasks.py b/tasks.py
index 24276c8..176201b 100644
--- a/tasks.py
+++ b/tasks.py
@@ -52,8 +52,8 @@ def noop(*args, **kwargs):
 
 
 @app.task(autoretry_for=(TwitterError, URLError, MastodonRatelimitError))
-def fetch_acc(id, cursor=None):
-    acc = Account.query.get(id)
+def fetch_acc(id_, cursor=None):
+    acc = Account.query.get(id_)
     print(f'fetching {acc}')
     try:
         action = noop
@@ -63,7 +63,7 @@ def fetch_acc(id, cursor=None):
             action = lib.mastodon.fetch_acc
         cursor = action(acc, cursor)
         if cursor:
-            fetch_acc.si(id, cursor).apply_async()
+            fetch_acc.si(id_, cursor).apply_async()
     finally:
         db.session.rollback()
         acc.touch_fetch()
@@ -188,8 +188,8 @@ def delete_from_account(account_id):
         action = lib.twitter.delete
         posts = refresh_posts(posts)
         if posts:
-            eligible = list(  # nosec
-                (post for post in posts if
+            eligible = list((  # nosec
+                post for post in posts if
                 (not account.policy_keep_favourites or not post.favourite)
                 and (not account.policy_keep_media or not post.has_media)
                 ))