diff --git a/brozzler/__init__.py b/brozzler/__init__.py
index 068b904..f305015 100644
--- a/brozzler/__init__.py
+++ b/brozzler/__init__.py
@@ -18,9 +18,10 @@ limitations under the License.
 """
 
 import logging
-import structlog
 from importlib.metadata import version as _version
 
+import structlog
+
 __version__ = _version("brozzler")
 
 
@@ -106,7 +107,10 @@ def behaviors(behaviors_dir=None):
     :param behaviors_dir: Directory containing `behaviors.yaml` and
     `js-templates/`. Defaults to brozzler dir.
     """
-    import os, yaml, string
+    import os
+    import string
+
+    import yaml
 
     global _behaviors
     if _behaviors is None:
@@ -121,7 +125,8 @@ def behavior_script(url, template_parameters=None, behaviors_dir=None):
     """
     Returns the javascript behavior string populated with template_parameters.
     """
-    import re, json
+    import json
+    import re
 
     logger = structlog.get_logger(logger_name=__name__)
 
@@ -245,7 +250,11 @@ def thread_raise(thread, exctype):
         TypeError if `exctype` is not a class
         ValueError, SystemError in case of unexpected problems
     """
-    import ctypes, inspect, threading, structlog
+    import ctypes
+    import inspect
+    import threading
+
+    import structlog
 
     logger = structlog.get_logger(exctype=exctype, thread=thread)
 
@@ -297,7 +306,10 @@ _jinja2_env = None
 def jinja2_environment(behaviors_dir=None):
     global _jinja2_env
     if not _jinja2_env:
-        import os, jinja2, json
+        import json
+        import os
+
+        import jinja2
 
         if behaviors_dir:
             _loader = jinja2.FileSystemLoader(
@@ -365,7 +377,8 @@ def _suggest_default_chrome_exe_mac():
 
 
 def suggest_default_chrome_exe():
-    import shutil, sys
+    import shutil
+    import sys
 
     # First ask mdfind, which lets us find it in non-default paths
     if sys.platform == "darwin":
@@ -395,8 +408,8 @@ import datetime
 EPOCH_UTC = datetime.datetime.fromtimestamp(0.0, tz=datetime.timezone.utc)
 
 
-from brozzler.robots import is_permitted_by_robots
 from brozzler.browser import Browser, BrowserPool, BrowsingException
+from brozzler.robots import is_permitted_by_robots
 
 __all__ = [
     "is_permitted_by_robots",
@@ -412,20 +425,21 @@ __all__ = [
 try:
     import doublethink
 
-    # All of these imports use doublethink for real and are unsafe
-    # to do if doublethink is unavailable.
-    from brozzler.worker import BrozzlerWorker
     from brozzler.frontier import RethinkDbFrontier
     from brozzler.model import (
-        new_job,
-        new_job_file,
-        new_site,
+        InvalidJobConf,
         Job,
         Page,
         Site,
-        InvalidJobConf,
+        new_job,
+        new_job_file,
+        new_site,
     )
 
+    # All of these imports use doublethink for real and are unsafe
+    # to do if doublethink is unavailable.
+    from brozzler.worker import BrozzlerWorker
+
     __all__.extend(
         [
             "Page",
diff --git a/brozzler/browser.py b/brozzler/browser.py
index a5fff4e..6b872e4 100644
--- a/brozzler/browser.py
+++ b/brozzler/browser.py
@@ -16,23 +16,23 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import logging
-import time
-import brozzler
+import base64
+import datetime
 import itertools
 import json
-import websocket
-import time
-import threading
-import brozzler
-from requests.structures import CaseInsensitiveDict
-import datetime
-import base64
-from ipaddress import AddressValueError
-from brozzler.chrome import Chrome
+import logging
 import socket
+import threading
+import time
+from ipaddress import AddressValueError
+
 import structlog
 import urlcanon
+import websocket
+from requests.structures import CaseInsensitiveDict
+
+import brozzler
+from brozzler.chrome import Chrome
 
 
 class BrowsingException(Exception):
diff --git a/brozzler/chrome.py b/brozzler/chrome.py
index 1b630cc..7dd6066 100644
--- a/brozzler/chrome.py
+++ b/brozzler/chrome.py
@@ -16,20 +16,22 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import urllib.request
-import time
-import threading
-import subprocess
+import json
 import os
-import brozzler
-import select
 import re
+import select
 import signal
 import sqlite3
-import structlog
-import json
-import tempfile
+import subprocess
 import sys
+import tempfile
+import threading
+import time
+import urllib.request
+
+import structlog
+
+import brozzler
 
 
 def check_version(chrome_exe):
diff --git a/brozzler/cli.py b/brozzler/cli.py
index 27e7e81..1fe5318 100755
--- a/brozzler/cli.py
+++ b/brozzler/cli.py
@@ -18,27 +18,28 @@ limitations under the License.
 """
 
 import argparse
-import brozzler
-import brozzler.worker
+import base64
 import datetime
 import json
 import logging
 import os
 import re
-import requests
-import doublethink
 import signal
 import string
-import structlog
 import sys
 import threading
 import time
 import traceback
 import warnings
-import yaml
-import base64
-import rethinkdb as rdb
 
+import doublethink
+import requests
+import rethinkdb as rdb
+import structlog
+import yaml
+
+import brozzler
+import brozzler.worker
 from brozzler import suggest_default_chrome_exe
 
 r = rdb.RethinkDB()
diff --git a/brozzler/dashboard/__init__.py b/brozzler/dashboard/__init__.py
index e623a01..15a836c 100644
--- a/brozzler/dashboard/__init__.py
+++ b/brozzler/dashboard/__init__.py
@@ -17,9 +17,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import structlog
 import sys
 
+import structlog
+
 logger = structlog.get_logger(logger_name=__name__)
 
 try:
@@ -32,13 +33,14 @@ except ImportError as e:
         e,
     )
     sys.exit(1)
-import doublethink
+import base64
+import importlib
 import json
 import os
-import importlib
+
+import doublethink
 import rethinkdb as rdb
 import yaml
-import base64
 
 r = rdb.RethinkDB()
 
@@ -284,8 +286,8 @@ def root(path):
 
 try:
     import gunicorn.app.base
-    from gunicorn.six import iteritems
     import gunicorn.glogging
+    from gunicorn.six import iteritems
 
     class BypassGunicornLogging(gunicorn.glogging.Logger):
         def setup(self, cfg):
@@ -327,6 +329,7 @@ except ImportError:
 
 def main(argv=None):
     import argparse
+
     import brozzler.cli
 
     argv = argv or sys.argv
diff --git a/brozzler/easy.py b/brozzler/easy.py
index 05f01a0..fc213f8 100644
--- a/brozzler/easy.py
+++ b/brozzler/easy.py
@@ -18,19 +18,22 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import structlog
 import sys
 
+import structlog
+
 logger = structlog.get_logger(logger_name=__name__)
 
 try:
+    import wsgiref.handlers
+    import wsgiref.simple_server
+
+    import pywb
     import warcprox
     import warcprox.main
-    import pywb
-    import brozzler.pywb
-    import wsgiref.simple_server
-    import wsgiref.handlers
+
     import brozzler.dashboard
+    import brozzler.pywb
 except ImportError as e:
     logger.critical(
         '%s: %s\n\nYou might need to run "pip install '
@@ -40,16 +43,18 @@ except ImportError as e:
     )
     sys.exit(1)
 import argparse
-import brozzler
-import brozzler.cli
 import os
-import socket
 import signal
+import socket
+import socketserver
 import threading
 import time
-import doublethink
 import traceback
-import socketserver
+
+import doublethink
+
+import brozzler
+import brozzler.cli
 
 
 def _build_arg_parser(argv=None):
diff --git a/brozzler/frontier.py b/brozzler/frontier.py
index 0ef3924..b37d5d1 100644
--- a/brozzler/frontier.py
+++ b/brozzler/frontier.py
@@ -16,15 +16,17 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import brozzler
+import datetime
 import random
 import time
-import datetime
+
+import doublethink
 import rethinkdb as rdb
 import structlog
-import doublethink
 import urlcanon
 
+import brozzler
+
 r = rdb.RethinkDB()
 
 
diff --git a/brozzler/model.py b/brozzler/model.py
index 1099c3b..49a9905 100644
--- a/brozzler/model.py
+++ b/brozzler/model.py
@@ -17,25 +17,27 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import brozzler
 import base64
-import cerberus
 import copy
 import datetime
-import doublethink
 import hashlib
 import json
 import os
 import re
-import structlog
 import time
-import urlcanon
 import urllib
 import uuid
-import yaml
 import zlib
 from typing import Optional
 
+import cerberus
+import doublethink
+import structlog
+import urlcanon
+import yaml
+
+import brozzler
+
 logger = structlog.get_logger(logger_name=__name__)
 
 
diff --git a/brozzler/pywb.py b/brozzler/pywb.py
index 5d714d0..b4b6280 100644
--- a/brozzler/pywb.py
+++ b/brozzler/pywb.py
@@ -19,6 +19,7 @@ limitations under the License.
 """
 
 import sys
+
 import structlog
 
 logger = structlog.get_logger(logger_name=__name__)
@@ -28,9 +29,9 @@ try:
     import pywb.cdx.cdxdomainspecific
     import pywb.cdx.cdxobject
     import pywb.cdx.cdxserver
-    import pywb.webapp.query_handler
     import pywb.framework.basehandlers
     import pywb.rewrite.wburl
+    import pywb.webapp.query_handler
 except ImportError as e:
     logger.critical(
         '%s: %s\n\nYou might need to run "pip install '
@@ -39,12 +40,14 @@ except ImportError as e:
         e,
     )
     sys.exit(1)
+import argparse
+import json
+
 import doublethink
 import rethinkdb as rdb
 import urlcanon
-import json
+
 import brozzler
-import argparse
 
 r = rdb.RethinkDB()
 
@@ -219,13 +222,17 @@ def support_in_progress_warcs():
 class SomeWbUrl(pywb.rewrite.wburl.WbUrl):
     def __init__(self, orig_url):
         import re
+
         import six
-
-        from six.moves.urllib.parse import urlsplit, urlunsplit
-        from six.moves.urllib.parse import quote_plus, quote, unquote_plus
-
-        from pywb.utils.loaders import to_native_str
         from pywb.rewrite.wburl import WbUrl
+        from pywb.utils.loaders import to_native_str
+        from six.moves.urllib.parse import (
+            quote,
+            quote_plus,
+            unquote_plus,
+            urlsplit,
+            urlunsplit,
+        )
 
         pywb.rewrite.wburl.BaseWbUrl.__init__(self)
 
@@ -372,8 +379,8 @@ def monkey_patch_fuzzy_query():
 # as such
 def _calc_search_range(url, match_type, surt_ordered=True, url_canon=None):
     # imports added here for brozzler
-    from pywb.utils.canonicalize import UrlCanonicalizer, UrlCanonicalizeException
     import six.moves.urllib.parse as urlparse
+    from pywb.utils.canonicalize import UrlCanonicalizeException, UrlCanonicalizer
 
     def inc_last_char(x):
         return x[0:-1] + chr(ord(x[-1]) + 1)
diff --git a/brozzler/robots.py b/brozzler/robots.py
index 2d3751e..7f249dd 100644
--- a/brozzler/robots.py
+++ b/brozzler/robots.py
@@ -23,13 +23,15 @@ limitations under the License.
 """
 
 import json
-import brozzler
+
 import reppy
 import reppy.cache
 import reppy.parser
 import requests
 import structlog
 
+import brozzler
+
 __all__ = ["is_permitted_by_robots"]
 
 # monkey-patch reppy to do substring user-agent matching, see top of file
diff --git a/brozzler/worker.py b/brozzler/worker.py
index 868ded4..3a58bfa 100644
--- a/brozzler/worker.py
+++ b/brozzler/worker.py
@@ -18,26 +18,29 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import brozzler
-import brozzler.browser
 import datetime
+import io
+import json
+import random
+import socket
+import tempfile
 import threading
 import time
 import urllib.request
-import json
-import PIL.Image
-import io
-import socket
-import random
-import requests
-import structlog
-import urllib3
-from urllib3.exceptions import TimeoutError, ProxyError
+
 import doublethink
-import tempfile
-import urlcanon
-from requests.structures import CaseInsensitiveDict
+import PIL.Image
+import requests
 import rethinkdb as rdb
+import structlog
+import urlcanon
+import urllib3
+from requests.structures import CaseInsensitiveDict
+from urllib3.exceptions import ProxyError, TimeoutError
+
+import brozzler
+import brozzler.browser
+
 from . import metrics
 
 r = rdb.RethinkDB()
diff --git a/brozzler/ydl.py b/brozzler/ydl.py
index ae756a0..f81d551 100644
--- a/brozzler/ydl.py
+++ b/brozzler/ydl.py
@@ -16,21 +16,24 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import yt_dlp
-from yt_dlp.utils import match_filter_func, ExtractorError
-import brozzler
-import urllib.request
-import tempfile
-import urlcanon
-import os
-import json
-import doublethink
 import datetime
-from . import metrics
+import json
+import os
 import random
-import structlog
+import tempfile
 import threading
 import time
+import urllib.request
+
+import doublethink
+import structlog
+import urlcanon
+import yt_dlp
+from yt_dlp.utils import ExtractorError, match_filter_func
+
+import brozzler
+
+from . import metrics
 
 thread_local = threading.local()
 
diff --git a/setup.py b/setup.py
index 8751e08..46bd957 100644
--- a/setup.py
+++ b/setup.py
@@ -17,9 +17,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import setuptools
 import os
 
+import setuptools
+
 
 def find_package_data(package):
     pkg_data = []
diff --git a/tests/test_brozzling.py b/tests/test_brozzling.py
index c187c42..03124a4 100755
--- a/tests/test_brozzling.py
+++ b/tests/test_brozzling.py
@@ -17,17 +17,18 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import pytest
-import brozzler
+import argparse
+import http.server
+import json
 import logging
 import os
-import http.server
-import threading
-import argparse
-import urllib
-import json
-import threading
 import socket
+import threading
+import urllib
+
+import pytest
+
+import brozzler
 
 arg_parser = argparse.ArgumentParser()
 brozzler.cli.add_common_options(arg_parser)
diff --git a/tests/test_cli.py b/tests/test_cli.py
index 076a466..3c8f0c5 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -17,11 +17,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import brozzler.cli
 import importlib.metadata
-import pytest
 import subprocess
+
 import doublethink
+import pytest
+
+import brozzler.cli
 
 
 def console_scripts():
diff --git a/tests/test_cluster.py b/tests/test_cluster.py
index d3ece4b..5949fd3 100644
--- a/tests/test_cluster.py
+++ b/tests/test_cluster.py
@@ -18,23 +18,23 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import pytest
+import datetime
 import http.server
-import threading
-import urllib.request
 import os
 import socket
-import doublethink
-import time
-import brozzler
-import datetime
-import requests
 import subprocess
-import http.server
-import structlog
 import sys
+import threading
+import time
+import urllib.request
+
+import doublethink
+import pytest
+import requests
+import structlog
 import warcprox
 
+import brozzler
 
 logger = structlog.get_logger(logger_name=__name__)
 
diff --git a/tests/test_units.py b/tests/test_units.py
index 096f632..33979bc 100644
--- a/tests/test_units.py
+++ b/tests/test_units.py
@@ -17,23 +17,24 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import pytest
+import datetime
 import http.server
-import threading
 import os
+import socket
+import sys
+import tempfile
+import threading
+import time
+import uuid
+from unittest import mock
+
+import pytest
+import requests
+import yaml
+
 import brozzler
 import brozzler.chrome
 import brozzler.ydl
-import yaml
-import datetime
-import requests
-import tempfile
-import uuid
-import socket
-import time
-import sys
-import threading
-from unittest import mock
 
 
 @pytest.fixture(scope="module")
diff --git a/vagrant/vagrant-brozzler-new-job.py b/vagrant/vagrant-brozzler-new-job.py
index b653b2b..44854d3 100755
--- a/vagrant/vagrant-brozzler-new-job.py
+++ b/vagrant/vagrant-brozzler-new-job.py
@@ -22,10 +22,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import sys
-import os
 import argparse
+import os
 import subprocess
+import sys
 
 
 def main(argv=[]):
diff --git a/vagrant/vagrant-brozzler-new-site.py b/vagrant/vagrant-brozzler-new-site.py
index 5e7503a..b76ff84 100755
--- a/vagrant/vagrant-brozzler-new-site.py
+++ b/vagrant/vagrant-brozzler-new-site.py
@@ -25,10 +25,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-import sys
-import os
 import argparse
+import os
 import subprocess
+import sys
 
 try:
     from shlex import quote