diff --git a/src/ptvsd/__init__.py b/src/ptvsd/__init__.py
index 1edf4f6b..ba3ebbe5 100644
--- a/src/ptvsd/__init__.py
+++ b/src/ptvsd/__init__.py
@@ -19,20 +19,21 @@ __all__ = [
     "wait_for_attach",
 ]
 
-# Force absolute path on Python 2.
+import codecs
 from os import path
+
+# Force absolute path on Python 2.
 __file__ = path.abspath(__file__)
-del path
 
 # Preload encodings that we're going to use to avoid import deadlocks on Python 2.
-import codecs
-codecs.lookup('ascii')
-codecs.lookup('utf8')
-codecs.lookup('utf-8')
-codecs.lookup('latin1')
-codecs.lookup('latin-1')
+codecs.lookup("ascii")
+codecs.lookup("utf8")
+codecs.lookup("utf-8")
+codecs.lookup("latin1")
+codecs.lookup("latin-1")
 
 from ptvsd import _version
+
 __version__ = _version.get_versions()["version"]
 del _version
 
diff --git a/src/ptvsd/__main__.py b/src/ptvsd/__main__.py
index 302fc3b1..3407dff1 100644
--- a/src/ptvsd/__main__.py
+++ b/src/ptvsd/__main__.py
@@ -48,6 +48,6 @@ if __name__ == "__main__":
     # this simplifies imports in the latter.
     import ptvsd  # noqa
     import pydevd  # noqa
-
     from ptvsd.server.__main__ import main
+
     main()
diff --git a/src/ptvsd/common/json.py b/src/ptvsd/common/json.py
index c98aede2..fdbf31db 100644
--- a/src/ptvsd/common/json.py
+++ b/src/ptvsd/common/json.py
@@ -19,6 +19,7 @@ class JsonEncoder(json.JSONEncoder):
     If the object implements __getstate__, then that method is invoked, and its
     result is serialized instead of the object itself.
     """
+
     def default(self, value):
         try:
             get_state = value.__getstate__
diff --git a/src/ptvsd/common/log.py b/src/ptvsd/common/log.py
index f1483c65..e50172b0 100644
--- a/src/ptvsd/common/log.py
+++ b/src/ptvsd/common/log.py
@@ -192,7 +192,9 @@ def to_file(filename=None):
                 "ptvsd.to_file() cannot generate log file name - ptvsd.options.log_dir is not set"
             )
             return
-        _filename = fmt("{0}/{1}-{2}.log", options.log_dir, filename_prefix, os.getpid())
+        _filename = fmt(
+            "{0}/{1}-{2}.log", options.log_dir, filename_prefix, os.getpid()
+        )
 
     file = io.open(_filename, "w", encoding="utf-8")
     info(
diff --git a/src/ptvsd/common/messaging.py b/src/ptvsd/common/messaging.py
index d6c9a2f5..803ef882 100644
--- a/src/ptvsd/common/messaging.py
+++ b/src/ptvsd/common/messaging.py
@@ -103,9 +103,8 @@ class JsonIOStream(object):
         self._writer.close()
 
     def _log_message(self, dir, data, logger=log.debug):
-        format_string = (
-            "{0} {1} " +
-            ("{2!j:indent=None}" if isinstance(data, list) else "{2!j}")
+        format_string = "{0} {1} " + (
+            "{2!j:indent=None}" if isinstance(data, list) else "{2!j}"
         )
         return logger(format_string, self.name, dir, data)
 
diff --git a/src/ptvsd/debugger.py b/src/ptvsd/debugger.py
index 72edf75c..c579e263 100644
--- a/src/ptvsd/debugger.py
+++ b/src/ptvsd/debugger.py
@@ -7,11 +7,7 @@ import ptvsd.server.options
 from ptvsd.server.__main__ import run_file, run_module, run_code
 
 
-RUNNERS = {
-    'module': run_module,
-    'script': run_file,
-    'code': run_code,
-}
+RUNNERS = {"module": run_module, "script": run_file, "code": run_code}
 
 # Not actually used, but VS will try to add entries to it.
 DONT_DEBUG = []
@@ -21,14 +17,16 @@ DONT_DEBUG = []
 # All new code should use the entrypoints in ptvsd.server.__main__ directly.
 def debug(filename, port_num, debug_id, debug_options, run_as):
     ptvsd.server.log.to_file()
-    ptvsd.server.log.info('debug{0!r}', (filename, port_num, debug_id, debug_options, run_as))
+    ptvsd.server.log.info(
+        "debug{0!r}", (filename, port_num, debug_id, debug_options, run_as)
+    )
 
     try:
         run = RUNNERS[run_as]
     except KeyError:
-        raise ValueError('run_as must be one of: {0!r}'.format(tuple(RUNNERS.keys())))
+        raise ValueError("run_as must be one of: {0!r}".format(tuple(RUNNERS.keys())))
 
-    ptvsd.server.options.target_kind = 'file' if run_as == 'script' else run_as
+    ptvsd.server.options.target_kind = "file" if run_as == "script" else run_as
     ptvsd.server.options.target = filename
     ptvsd.server.options.port = port_num
     ptvsd.server.options.client = True