diff --git a/i3pystatus/__init__.py b/i3pystatus/__init__.py
index 5e806fd..0f9993f 100644
--- a/i3pystatus/__init__.py
+++ b/i3pystatus/__init__.py
@@ -8,6 +8,13 @@ from i3pystatus.core.util import formatp
 
 __path__ = extend_path(__path__, __name__)
 
+__all__ = [
+    "Status",
+    "Module", "IntervalModule",
+    "SettingsBase",
+    "formatp",
+]
+
 
 def main():
     from i3pystatus.clock import Clock
diff --git a/i3pystatus/core/io.py b/i3pystatus/core/io.py
index 0b634c6..c57816b 100644
--- a/i3pystatus/core/io.py
+++ b/i3pystatus/core/io.py
@@ -2,7 +2,6 @@
 import time
 import json
 import sys
-import threading
 from contextlib import contextmanager
 
 
diff --git a/i3pystatus/core/util.py b/i3pystatus/core/util.py
index 521b9cc..d242370 100644
--- a/i3pystatus/core/util.py
+++ b/i3pystatus/core/util.py
@@ -1,14 +1,10 @@
 
 import collections
 import functools
-import itertools
 import re
 import socket
 import string
 
-from i3pystatus.core.exceptions import *
-from i3pystatus.core.imputil import ClassFinder
-
 
 def lchop(string, prefix):
     """Removes a prefix from string
diff --git a/i3pystatus/mail/imap.py b/i3pystatus/mail/imap.py
index 760a739..7b3d478 100644
--- a/i3pystatus/mail/imap.py
+++ b/i3pystatus/mail/imap.py
@@ -2,8 +2,6 @@
 # -*- coding: utf-8 -*-
 
 import sys
-import json
-from datetime import datetime, timedelta
 import imaplib
 
 from i3pystatus.mail import Backend
@@ -45,7 +43,7 @@ class IMAP(Backend):
 
         try:
             self.connection.select(self.mailbox)
-        except Exception as e:
+        except Exception:
             self.connection = None
 
         return self.connection
diff --git a/i3pystatus/mail/notmuchmail.py b/i3pystatus/mail/notmuchmail.py
index 6f434c2..a207fbe 100644
--- a/i3pystatus/mail/notmuchmail.py
+++ b/i3pystatus/mail/notmuchmail.py
@@ -4,7 +4,6 @@
 # note that this needs the notmuch python bindings. For more info see:
 # http://notmuchmail.org/howto/#index4h2
 import notmuch
-import json
 
 from i3pystatus.mail import Backend
 
diff --git a/i3pystatus/mail/thunderbird.py b/i3pystatus/mail/thunderbird.py
index 787a8a8..0f16eee 100644
--- a/i3pystatus/mail/thunderbird.py
+++ b/i3pystatus/mail/thunderbird.py
@@ -7,9 +7,6 @@
 # The plugin must be active and thunderbird running for the module to work
 # properly.
 
-import json
-import threading
-import time
 from functools import partial
 
 import dbus
diff --git a/i3pystatus/mem.py b/i3pystatus/mem.py
index 0f92b58..6bf5865 100644
--- a/i3pystatus/mem.py
+++ b/i3pystatus/mem.py
@@ -1,7 +1,7 @@
 from i3pystatus import IntervalModule
 from psutil import virtual_memory
 
-MEGABYTE = 1024**2
+MEGABYTE = 1024 * 1024
 
 
 class Mem(IntervalModule):
diff --git a/i3pystatus/mkdocs.py b/i3pystatus/mkdocs.py
index 91eda06..2d992f5 100755
--- a/i3pystatus/mkdocs.py
+++ b/i3pystatus/mkdocs.py
@@ -1,9 +1,6 @@
 #!/usr/bin/env python
 
-import sys
-import io
 import pkgutil
-from collections import namedtuple
 import textwrap
 
 import i3pystatus
diff --git a/i3pystatus/modsde.py b/i3pystatus/modsde.py
index 98e9289..97e4dd8 100644
--- a/i3pystatus/modsde.py
+++ b/i3pystatus/modsde.py
@@ -1,9 +1,5 @@
 #!/usr/bin/env python
 
-import sys
-import json
-import time
-import threading
 import urllib.request
 import urllib.parse
 import urllib.error
diff --git a/i3pystatus/pulseaudio/__init__.py b/i3pystatus/pulseaudio/__init__.py
index 5a38536..cec8bee 100644
--- a/i3pystatus/pulseaudio/__init__.py
+++ b/i3pystatus/pulseaudio/__init__.py
@@ -2,6 +2,7 @@ from .pulse import *
 
 from i3pystatus import Module
 
+
 class PulseAudio(Module):
 
     """