diff --git a/pyproject.toml b/pyproject.toml
index 3f5ddb94..40b34b0a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,11 +8,8 @@ build-backend = "setuptools.build_meta"
 # The only exclusions that should remain in the end are _vendored and versioneer.
 exclude = '''
 ( __pycache__
-| ^/setup.py
 | ^/versioneer.py
 | ^/src/ptvsd/_vendored
 | ^/src/ptvsd/_version.py
-| ^/src/ptvsd/common
-| ^/src/ptvsd/server
 )
 '''
diff --git a/setup.py b/setup.py
index edee25fc..c16b7636 100644
--- a/setup.py
+++ b/setup.py
@@ -11,45 +11,50 @@ import sys
 
 
 pure = None
-if '--pure' in sys.argv:
+if "--pure" in sys.argv:
     pure = True
-    sys.argv.remove('--pure')
-elif '--universal' in sys.argv:
+    sys.argv.remove("--pure")
+elif "--universal" in sys.argv:
     pure = True
-elif '--abi' in sys.argv:
+elif "--abi" in sys.argv:
     pure = False
-    sys.argv.remove('--abi')
+    sys.argv.remove("--abi")
 
 
 from setuptools import setup  # noqa
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 import versioneer  # noqa
+
 del sys.path[0]
 
-sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'src'))
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "src"))
 import ptvsd
 import ptvsd._vendored
+
 del sys.path[0]
 
 
-PYDEVD_ROOT = ptvsd._vendored.project_root('pydevd')
+PYDEVD_ROOT = ptvsd._vendored.project_root("pydevd")
 PTVSD_ROOT = os.path.dirname(os.path.abspath(ptvsd.__file__))
 
 
 def get_buildplatform():
-    if '-p' in sys.argv:
-        return sys.argv[sys.argv.index('-p') + 1]
+    if "-p" in sys.argv:
+        return sys.argv[sys.argv.index("-p") + 1]
     return None
 
+
 def cython_build():
-    print('Compiling extension modules (set SKIP_CYTHON_BUILD=1 to omit)')
-    subprocess.call([
-        sys.executable,
-        os.path.join(PYDEVD_ROOT, 'setup_cython.py'),
-        'build_ext',
-        '-i',
-    ])
+    print("Compiling extension modules (set SKIP_CYTHON_BUILD=1 to omit)")
+    subprocess.call(
+        [
+            sys.executable,
+            os.path.join(PYDEVD_ROOT, "setup_cython.py"),
+            "build_ext",
+            "-i",
+        ]
+    )
 
 
 def iter_vendored_files():
@@ -61,7 +66,7 @@ def iter_vendored_files():
             yield filename
 
 
-with open('DESCRIPTION.md', 'r') as fh:
+with open("DESCRIPTION.md", "r") as fh:
     long_description = fh.read()
 
 
@@ -73,56 +78,57 @@ try:
             _bdist_wheel.finalize_options(self)
             self.root_is_pure = pure
 
+
 except ImportError:
     bdist_wheel = None
 
-if __name__ == '__main__':
-    if not os.getenv('SKIP_CYTHON_BUILD'):
+if __name__ == "__main__":
+    if not os.getenv("SKIP_CYTHON_BUILD"):
         cython_build()
 
     cmds = versioneer.get_cmdclass()
-    cmds['bdist_wheel'] = bdist_wheel
+    cmds["bdist_wheel"] = bdist_wheel
 
     extras = {}
     platforms = get_buildplatform()
     if platforms is not None:
-        extras['platforms'] = platforms
+        extras["platforms"] = platforms
 
     setup(
-        name='ptvsd',
+        name="ptvsd",
         version=versioneer.get_version(),
-        description='Remote debugging server for Python support in Visual Studio and Visual Studio Code', # noqa
+        description="Remote debugging server for Python support in Visual Studio and Visual Studio Code",  # noqa
         long_description=long_description,
-        long_description_content_type='text/markdown',
-        license='MIT',
-        author='Microsoft Corporation',
-        author_email='ptvshelp@microsoft.com',
-        url='https://aka.ms/ptvs',
-        python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*',
+        long_description_content_type="text/markdown",
+        license="MIT",
+        author="Microsoft Corporation",
+        author_email="ptvshelp@microsoft.com",
+        url="https://aka.ms/ptvs",
+        python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*",
         classifiers=[
-            'Development Status :: 5 - Production/Stable',
-            'Programming Language :: Python :: 2.7',
-            'Programming Language :: Python :: 3.4',
-            'Programming Language :: Python :: 3.5',
-            'Programming Language :: Python :: 3.6',
-            'Programming Language :: Python :: 3.7',
-            'Topic :: Software Development :: Debuggers',
-            'Operating System :: OS Independent',
-            'License :: OSI Approved :: Eclipse Public License 2.0 (EPL-2.0)',
-            'License :: OSI Approved :: MIT License',
+            "Development Status :: 5 - Production/Stable",
+            "Programming Language :: Python :: 2.7",
+            "Programming Language :: Python :: 3.4",
+            "Programming Language :: Python :: 3.5",
+            "Programming Language :: Python :: 3.6",
+            "Programming Language :: Python :: 3.7",
+            "Topic :: Software Development :: Debuggers",
+            "Operating System :: OS Independent",
+            "License :: OSI Approved :: Eclipse Public License 2.0 (EPL-2.0)",
+            "License :: OSI Approved :: MIT License",
         ],
-        package_dir={'': 'src'},
+        package_dir={"": "src"},
         packages=[
-            'ptvsd',
-            'ptvsd.adapter',
-            'ptvsd.common',
-            'ptvsd.launcher',
-            'ptvsd.server',
-            'ptvsd._vendored',
+            "ptvsd",
+            "ptvsd.adapter",
+            "ptvsd.common",
+            "ptvsd.launcher",
+            "ptvsd.server",
+            "ptvsd._vendored",
         ],
         package_data={
-            'ptvsd': ['ThirdPartyNotices.txt'],
-            'ptvsd._vendored': list(iter_vendored_files()),
+            "ptvsd": ["ThirdPartyNotices.txt"],
+            "ptvsd._vendored": list(iter_vendored_files()),
         },
         cmdclass=cmds,
         **extras
diff --git a/src/ptvsd/__init__.py b/src/ptvsd/__init__.py
index 43bd1979..128c8ffb 100644
--- a/src/ptvsd/__init__.py
+++ b/src/ptvsd/__init__.py
@@ -42,6 +42,7 @@ def wait_for_attach():
     """
 
     from ptvsd.server import api
+
     return api.wait_for_attach()
 
 
@@ -75,6 +76,7 @@ def enable_attach(address, log_dir=None, multiprocess=True):
     """
 
     from ptvsd.server import api
+
     return api.enable_attach(address, log_dir)
 
 
@@ -102,6 +104,7 @@ def attach(address, log_dir=None, multiprocess=True):
     """
 
     from ptvsd.server import api
+
     return api.attach(address, log_dir)
 
 
@@ -110,6 +113,7 @@ def is_attached():
     """
 
     from ptvsd.server import api
+
     return api.is_attached()
 
 
@@ -119,6 +123,7 @@ def break_into_debugger():
     """
 
     from ptvsd.server import api
+
     return api.break_into_debugger()
 
 
@@ -131,6 +136,7 @@ def debug_this_thread():
     """
 
     from ptvsd.server import api
+
     return api.debug_this_thread()
 
 
@@ -152,6 +158,7 @@ def tracing(should_trace=None):
         Whether to enable or disable tracing.
     """
     from ptvsd.server import api
+
     return api.tracing(should_trace)
 
 
diff --git a/src/ptvsd/__main__.py b/src/ptvsd/__main__.py
index 7b4d8f16..edc32d33 100644
--- a/src/ptvsd/__main__.py
+++ b/src/ptvsd/__main__.py
@@ -37,7 +37,9 @@ if __name__ == "__main__":
         # Do not use dirname() to walk up - this can be a relative path, e.g. ".".
         sys.path[0] = sys.path[0] + "/../"
         import ptvsd  # noqa
+
         del sys.path[0]
 
     from ptvsd.server import cli
+
     cli.main()
diff --git a/src/ptvsd/adapter/__main__.py b/src/ptvsd/adapter/__main__.py
index dca80e85..9b9992ee 100644
--- a/src/ptvsd/adapter/__main__.py
+++ b/src/ptvsd/adapter/__main__.py
@@ -65,7 +65,7 @@ def _parse_argv(argv):
         type=int,
         default=None,
         metavar="PORT",
-        help=argparse.SUPPRESS
+        help=argparse.SUPPRESS,
     )
 
     parser.add_argument(
diff --git a/src/ptvsd/adapter/components.py b/src/ptvsd/adapter/components.py
index 7dd56dd0..dc0f94bf 100644
--- a/src/ptvsd/adapter/components.py
+++ b/src/ptvsd/adapter/components.py
@@ -82,7 +82,9 @@ class Component(util.Observable):
             except messaging.MessageHandlingError as exc:
                 exc.propagate(message)
             except messaging.JsonIOError as exc:
-                raise message.cant_handle("{0} disconnected unexpectedly", exc.stream.name, silent=True)
+                raise message.cant_handle(
+                    "{0} disconnected unexpectedly", exc.stream.name, silent=True
+                )
 
         return lock_and_handle
 
diff --git a/src/ptvsd/common/sockets.py b/src/ptvsd/common/sockets.py
index 2ec39e95..61021248 100644
--- a/src/ptvsd/common/sockets.py
+++ b/src/ptvsd/common/sockets.py
@@ -11,7 +11,7 @@ import socket
 def create_server(host, port, timeout=None):
     """Return a local server socket listening on the given port."""
     if host is None:
-        host = 'localhost'
+        host = "127.0.0.1"
     try:
         server = _new_sock()
         server.bind((host, port))
@@ -31,7 +31,7 @@ def create_client():
 
 def _new_sock():
     sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
-    if platform.system() == 'Windows':
+    if platform.system() == "Windows":
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
     else:
         sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
diff --git a/src/ptvsd/server/__init__.py b/src/ptvsd/server/__init__.py
index b57df6c5..c0cb7fa4 100644
--- a/src/ptvsd/server/__init__.py
+++ b/src/ptvsd/server/__init__.py
@@ -6,4 +6,4 @@ from __future__ import absolute_import, print_function, unicode_literals
 
 # "force_pydevd" must be imported first to ensure (via side effects)
 # that the ptvsd-vendored copy of pydevd gets used.
-import ptvsd._vendored.force_pydevd # noqa
+import ptvsd._vendored.force_pydevd  # noqa
diff --git a/src/ptvsd/server/api.py b/src/ptvsd/server/api.py
index 3749928a..324cf712 100644
--- a/src/ptvsd/server/api.py
+++ b/src/ptvsd/server/api.py
@@ -126,7 +126,7 @@ def enable_attach(dont_trace_start_patterns, dont_trace_end_patterns):
         # so never wait on the adapter process
         process = subprocess.Popen(adapter_args, bufsize=0)
         # Ensure that we ignore the adapter process when terminating the
-        # debugger. 
+        # debugger.
         pydevd.add_dont_terminate_child_pid(process.pid)
 
     server_opts.port = port_queue.get(True, _QUEUE_TIMEOUT)
diff --git a/src/ptvsd/server/attach_pid_injected.py b/src/ptvsd/server/attach_pid_injected.py
index 162f2a82..4a6d1802 100644
--- a/src/ptvsd/server/attach_pid_injected.py
+++ b/src/ptvsd/server/attach_pid_injected.py
@@ -14,7 +14,8 @@ _ptvsd_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
 def attach(host, port, client, log_dir=None):
     try:
         import sys
-        if 'threading' not in sys.modules:
+
+        if "threading" not in sys.modules:
             try:
 
                 def on_warn(msg):
@@ -28,22 +29,26 @@ def attach(host, port, client, log_dir=None):
 
                 pydevd_attach_to_process_path = os.path.join(
                     _ptvsd_dir,
-                    'ptvsd',
-                    '_vendored',
-                    'pydevd',
-                    'pydevd_attach_to_process')
+                    "ptvsd",
+                    "_vendored",
+                    "pydevd",
+                    "pydevd_attach_to_process",
+                )
                 assert os.path.exists(pydevd_attach_to_process_path)
                 sys.path.insert(0, pydevd_attach_to_process_path)
 
                 # NOTE: that it's not a part of the pydevd PYTHONPATH
                 import attach_script
+
                 attach_script.fix_main_thread_id(
-                    on_warn=on_warn, on_exception=on_exception, on_critical=on_critical)
+                    on_warn=on_warn, on_exception=on_exception, on_critical=on_critical
+                )
 
                 # NOTE: At this point it should be safe to remove this.
                 sys.path.remove(pydevd_attach_to_process_path)
             except:
                 import traceback
+
                 traceback.print_exc()
                 raise
 
@@ -57,6 +62,7 @@ def attach(host, port, client, log_dir=None):
 
         from ptvsd.common import options as common_opts
         from ptvsd.server import options
+
         if log_dir is not None:
             common_opts.log_dir = log_dir
         options.client = client
@@ -69,9 +75,11 @@ def attach(host, port, client, log_dir=None):
             ptvsd.enable_attach((options.host, options.port))
 
         from ptvsd.common import log
+
         log.info("Debugger successfully injected")
 
     except:
         import traceback
+
         traceback.print_exc()
         raise log.exception()
diff --git a/src/ptvsd/server/options.py b/src/ptvsd/server/options.py
index de481e8b..2cba5db2 100644
--- a/src/ptvsd/server/options.py
+++ b/src/ptvsd/server/options.py
@@ -28,7 +28,7 @@ If target_kind is 'code', then target is the code to run.
 If target_kind is 'pid', then target is the process ID to attach to.
 """
 
-host = '127.0.0.1'
+host = "127.0.0.1"
 """Name or IP address of the network interface used by ptvsd.server. If runing in server
 mode, this is the interface on which it listens for incoming connections. If running
 in client mode, this is the interface to which it connects.