diff --git a/Lib/packaging/command/build_scripts.py b/Lib/packaging/command/build_scripts.py
index fe14e0a..d651ae0 100644
--- a/Lib/packaging/command/build_scripts.py
+++ b/Lib/packaging/command/build_scripts.py
@@ -3,7 +3,7 @@
 import os
 import re
 import sysconfig
-import tokenize
+from tokenize import detect_encoding
 
 from packaging.command.cmd import Command
 from packaging.util import convert_path, newer
@@ -83,7 +83,7 @@
                     raise
                 f = None
             else:
-                encoding, lines = tokenize.detect_encoding(f.readline)
+                encoding, lines = detect_encoding(f.readline)
                 f.seek(0)
                 first_line = f.readline()
                 if not first_line:
diff --git a/Lib/packaging/create.py b/Lib/packaging/create.py
index 1e84e2e..34a8c82 100644
--- a/Lib/packaging/create.py
+++ b/Lib/packaging/create.py
@@ -25,10 +25,11 @@
 import glob
 import shutil
 import sysconfig
-import tokenize
 from hashlib import md5
 from textwrap import dedent
+from tokenize import detect_encoding
 from configparser import RawConfigParser
+
 # importing this with an underscore as it should be replaced by the
 # dict form or another structures for all purposes
 from packaging._trove import all_classifiers as _CLASSIFIERS_LIST
@@ -111,7 +112,7 @@
     been loaded before, because we are monkey patching its setup function with
     a particular one"""
     with open("setup.py", "rb") as f:
-        encoding, lines = tokenize.detect_encoding(f.readline)
+        encoding, lines = detect_encoding(f.readline)
     with open("setup.py", encoding=encoding) as f:
         imp.load_module("setup", f, "setup.py", (".py", "r", imp.PY_SOURCE))
 
diff --git a/Lib/shutil.py b/Lib/shutil.py
index 0c096cb..2025ef8 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -391,7 +391,7 @@
         compress_ext['bzip2'] = '.bz2'
 
     # flags for compression program, each element of list will be an argument
-    if compress is not None and compress not in compress_ext.keys():
+    if compress is not None and compress not in compress_ext:
         raise ValueError("bad value for 'compress', or compression format not "
                          "supported : {0}".format(compress))
 
@@ -497,7 +497,7 @@
     'gztar': (_make_tarball, [('compress', 'gzip')], "gzip'ed tar-file"),
     'bztar': (_make_tarball, [('compress', 'bzip2')], "bzip2'ed tar-file"),
     'tar':   (_make_tarball, [('compress', None)], "uncompressed tar file"),
-    'zip':   (_make_zipfile, [],"ZIP file")
+    'zip':   (_make_zipfile, [], "ZIP file")
     }
 
 if _BZ2_SUPPORTED:
@@ -530,7 +530,7 @@
     if not isinstance(extra_args, (tuple, list)):
         raise TypeError('extra_args needs to be a sequence')
     for element in extra_args:
-        if not isinstance(element, (tuple, list)) or len(element) !=2 :
+        if not isinstance(element, (tuple, list)) or len(element) !=2:
             raise TypeError('extra_args elements are : (arg_name, value)')
 
     _ARCHIVE_FORMATS[name] = (function, extra_args, description)
@@ -682,7 +682,7 @@
             if not name.endswith('/'):
                 # file
                 data = zip.read(info.filename)
-                f = open(target,'wb')
+                f = open(target, 'wb')
                 try:
                     f.write(data)
                 finally:
diff --git a/Lib/test/test_sysconfig.py b/Lib/test/test_sysconfig.py
index 773d523..08b40a1 100644
--- a/Lib/test/test_sysconfig.py
+++ b/Lib/test/test_sysconfig.py
@@ -39,7 +39,7 @@
         self._config_vars = copy(sysconfig._CONFIG_VARS)
         self._added_envvars = []
         self._changed_envvars = []
-        for var in ('MACOSX_DEPLOYMENT_TARGET', 'Path'):
+        for var in ('MACOSX_DEPLOYMENT_TARGET', 'PATH'):
             if var in os.environ:
                 self._changed_envvars.append((var, os.environ[var]))
             else:
@@ -87,21 +87,19 @@
         scheme = get_paths()
         default_scheme = _get_default_scheme()
         wanted = _expand_vars(default_scheme, None)
-        wanted = list(wanted.items())
-        wanted.sort()
-        scheme = list(scheme.items())
-        scheme.sort()
+        wanted = sorted(wanted.items())
+        scheme = sorted(scheme.items())
         self.assertEqual(scheme, wanted)
 
     def test_get_path(self):
-        # xxx make real tests here
+        # XXX make real tests here
         for scheme in _SCHEMES:
             for name in _SCHEMES[scheme]:
                 res = get_path(name, scheme)
 
     def test_get_config_vars(self):
         cvars = get_config_vars()
-        self.assertTrue(isinstance(cvars, dict))
+        self.assertIsInstance(cvars, dict)
         self.assertTrue(cvars)
 
     def test_get_platform(self):
@@ -236,8 +234,8 @@
         # On Windows, the EXE needs to know where pythonXY.dll is at so we have
         # to add the directory to the path.
         if sys.platform == "win32":
-            os.environ["Path"] = "{};{}".format(
-                os.path.dirname(sys.executable), os.environ["Path"])
+            os.environ["PATH"] = "{};{}".format(
+                os.path.dirname(sys.executable), os.environ["PATH"])
 
         # Issue 7880
         def get(python):