commit 7b0a3fd85beb67c990da3fb1b690444a27a6ee42
Author: Tom Hughes <tom@compton.nu>
Date:   Fri Aug 23 09:33:14 2019 +0100

    Fix python 3.8 warnings

diff --git a/pylib/gyp/input.py b/pylib/gyp/input.py
index 42c279cf..013231dc 100644
--- a/pylib/gyp/input.py
+++ b/pylib/gyp/input.py
@@ -1181,7 +1181,7 @@ def LoadVariablesFromVariablesDict(variables, the_dict, the_dict_key):
       if variable_name in variables:
         # If the variable is already set, don't set it.
         continue
-      if the_dict_key is 'variables' and variable_name in the_dict:
+      if the_dict_key == 'variables' and variable_name in the_dict:
         # If the variable is set without a % in the_dict, and the_dict is a
         # variables dict (making |variables| a varaibles sub-dict of a
         # variables dict), use the_dict's definition.
diff --git a/test/lib/TestCmd.py b/test/lib/TestCmd.py
index 1ec50933..457694c8 100644
--- a/test/lib/TestCmd.py
+++ b/test/lib/TestCmd.py
@@ -283,7 +283,7 @@ if os.name in ('posix', 'nt'):
 else:
     tempfile.template = 'testcmd.'
 
-re_space = re.compile('\s')
+re_space = re.compile(r'\s')
 
 _Cleanup = []
 
@@ -882,7 +882,7 @@ class TestCmd(object):
                 #self.diff_function = difflib.unified_diff
         self._dirlist = []
         self._preserve = {'pass_test': 0, 'fail_test': 0, 'no_result': 0}
-        if 'PRESERVE' in os.environ and os.environ['PRESERVE'] is not '':
+        if 'PRESERVE' in os.environ and os.environ['PRESERVE'] != '':
             self._preserve['pass_test'] = os.environ['PRESERVE']
             self._preserve['fail_test'] = os.environ['PRESERVE']
             self._preserve['no_result'] = os.environ['PRESERVE']
@@ -1103,7 +1103,7 @@ class TestCmd(object):
         the temporary working directories to be preserved for all
         conditions.
         """
-        if conditions is ():
+        if len(conditions) == 0:
             conditions = ('pass_test', 'fail_test', 'no_result')
         for cond in conditions:
             self._preserve[cond] = 1
diff --git a/test/lib/TestGyp.py b/test/lib/TestGyp.py
index cba2d3cc..43865ee1 100644
--- a/test/lib/TestGyp.py
+++ b/test/lib/TestGyp.py
@@ -742,7 +742,7 @@ def FindVisualStudioInstallation():
           build_tool = None
       if not build_tool:
         args1 = ['reg', 'query',
-                    'HKLM\Software\Microsoft\VisualStudio\SxS\VS7',
+                    r'HKLM\Software\Microsoft\VisualStudio\SxS\VS7',
                     '/v', '15.0', '/reg:32']
         build_tool = subprocess.check_output(args1).decode(
             'utf-8', 'ignore').strip().split(b'\r\n').pop().split(b' ').pop()