diff --git a/golden-files/help b/golden-files/help
index c62ac1d..b25de6c 100644
--- a/golden-files/help
+++ b/golden-files/help
@@ -10,7 +10,8 @@
 │by selecting this status indicator with the cursor. The types of status are                       │
 │listed below.                                                                                     │
 │                                                                                                  │
-│The reports are cached in the codebase's root directory in a ".vigil" directory.                  │
+│The reports are cached in the codebase's root directory in a ".vigil"                             │
+│directory.                                                                                        │
 │                                                                                                  │
 │Keys:                                                                                             │
 │  h - Show the help screen. (toggle)                                                              │
@@ -56,5 +57,4 @@
 │                                                                                                  │
 │                                                                                                  │
 │                                                                                                  │
-│                                                                                                  │
 └──────────────────────────────────────────────────────────────────────────────────────────────────┘
\ No newline at end of file
diff --git a/tools.py b/tools.py
index d01da23..81c9d66 100644
--- a/tools.py
+++ b/tools.py
@@ -17,7 +17,6 @@ import os.path
 import pickle
 import pwd
 import stat
-import string
 import subprocess
 import tempfile
 import time
diff --git a/vigil b/vigil
index a9dd589..6aafe4d 100755
--- a/vigil
+++ b/vigil
@@ -15,10 +15,41 @@ A status indicator summarises the state of each report, and a report is viewed
 by selecting this status indicator with the cursor. The types of status are
 listed below.
 
-The reports are cached in the codebase's root directory in a ".vigil" directory.
+The reports are cached in the codebase's root directory in a ".vigil"
+directory.
 """
 
 
+import asyncio
+import collections
+import contextlib
+import functools
+import gzip
+import multiprocessing
+import os
+import pickle
+import shutil
+import signal
+import subprocess
+import sys
+import tempfile
+import threading
+import time
+import traceback
+
+import docopt
+import pyinotify
+import urwid
+import urwid.raw_display
+
+import fill3
+import sandbox_fs
+import terminal
+import termstr
+import tools
+import worker
+
+
 USAGE = """
 Usage:
   vigil [options] <directory>
@@ -55,36 +86,6 @@ KEYS_DOC = """Keys:
 """
 
 
-import asyncio
-import collections
-import contextlib
-import functools
-import gzip
-import multiprocessing
-import os
-import pickle
-import shutil
-import signal
-import subprocess
-import sys
-import tempfile
-import threading
-import time
-import traceback
-
-import docopt
-import pyinotify
-import urwid
-import urwid.raw_display
-
-import fill3
-import sandbox_fs
-import terminal
-import termstr
-import tools
-import worker
-
-
 _LOG_PATH = os.path.join(os.getcwd(), "vigil.log")
 
 
@@ -686,11 +687,11 @@ class Screen:
         self._log.log_command("Paused workers." if self._is_paused else
                               "Running workers...")
         if self._is_paused:
-            for worker in self.workers:
-                worker.pause()
+            for worker_ in self.workers:
+                worker_.pause()
         else:
-            for worker in self.workers:
-                worker.continue_()
+            for worker_ in self.workers:
+                worker_.continue_()
 
     def quit_(self):
         os.kill(os.getpid(), signal.SIGINT)
@@ -936,11 +937,11 @@ def main(root_path, loop, worker_count=None, is_sandboxed=True,
         def exit_loop():
             log.log_command("Exiting...")
             time.sleep(0.05)
-            for worker in workers:
-                worker.pause()
-                worker.future.cancel()
-                if worker.result is not None:
-                    worker.result.reset()
+            for worker_ in workers:
+                worker_.pause()
+                worker_.future.cancel()
+                if worker_.result is not None:
+                    worker_.result.reset()
             loop.stop()
         loop.add_signal_handler(signal.SIGWINCH, on_window_resize)
         loop.add_signal_handler(signal.SIGINT, exit_loop)
diff --git a/worker.py b/worker.py
index 5ba2089..0299eca 100755
--- a/worker.py
+++ b/worker.py
@@ -6,7 +6,6 @@
 import asyncio
 import os
 import signal
-import subprocess
 
 import psutil
 
@@ -47,7 +46,7 @@ class Worker:
         return tools.Status(int(data))
 
     async def job_runner(self, summary, log, jobs_added_event,
-                   appearance_changed_event):
+                         appearance_changed_event):
         await self.create_process()
         _make_process_nicest(self.child_pid)
         while True:
@@ -64,7 +63,7 @@ class Worker:
                             os.kill(os.getpid(), signal.SIGINT)
                     break
                 await self.result.run(log, appearance_changed_event,
-                                           self)
+                                      self)
                 summary.completed_total += 1
             jobs_added_event.clear()
 
diff --git a/worker_test.py b/worker_test.py
index a7557ab..3bedb46 100755
--- a/worker_test.py
+++ b/worker_test.py
@@ -10,7 +10,6 @@ import shutil
 import tempfile
 import unittest
 
-import sandbox_fs
 import tools
 import vigil
 import worker