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commit 7b0a3fd85beb67c990da3fb1b690444a27a6ee42
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Author: Tom Hughes <tom@compton.nu>
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Date:   Fri Aug 23 09:33:14 2019 +0100
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    Fix python 3.8 warnings
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diff --git a/pylib/gyp/input.py b/pylib/gyp/input.py
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index 42c279cf..013231dc 100644
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--- a/pylib/gyp/input.py
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+++ b/pylib/gyp/input.py
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@@ -1181,7 +1181,7 @@ def LoadVariablesFromVariablesDict(variables, the_dict, the_dict_key):
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       if variable_name in variables:
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         # If the variable is already set, don't set it.
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         continue
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-      if the_dict_key is 'variables' and variable_name in the_dict:
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+      if the_dict_key == 'variables' and variable_name in the_dict:
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         # If the variable is set without a % in the_dict, and the_dict is a
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         # variables dict (making |variables| a varaibles sub-dict of a
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         # variables dict), use the_dict's definition.
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diff --git a/test/lib/TestCmd.py b/test/lib/TestCmd.py
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index 1ec50933..457694c8 100644
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--- a/test/lib/TestCmd.py
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+++ b/test/lib/TestCmd.py
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@@ -283,7 +283,7 @@ if os.name in ('posix', 'nt'):
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 else:
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     tempfile.template = 'testcmd.'
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-re_space = re.compile('\s')
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+re_space = re.compile(r'\s')
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 _Cleanup = []
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@@ -882,7 +882,7 @@ class TestCmd(object):
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                 #self.diff_function = difflib.unified_diff
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         self._dirlist = []
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         self._preserve = {'pass_test': 0, 'fail_test': 0, 'no_result': 0}
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-        if 'PRESERVE' in os.environ and os.environ['PRESERVE'] is not '':
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+        if 'PRESERVE' in os.environ and os.environ['PRESERVE'] != '':
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             self._preserve['pass_test'] = os.environ['PRESERVE']
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             self._preserve['fail_test'] = os.environ['PRESERVE']
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             self._preserve['no_result'] = os.environ['PRESERVE']
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@@ -1103,7 +1103,7 @@ class TestCmd(object):
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         the temporary working directories to be preserved for all
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         conditions.
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         """
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-        if conditions is ():
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+        if len(conditions) == 0:
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             conditions = ('pass_test', 'fail_test', 'no_result')
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         for cond in conditions:
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             self._preserve[cond] = 1
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diff --git a/test/lib/TestGyp.py b/test/lib/TestGyp.py
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index cba2d3cc..43865ee1 100644
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--- a/test/lib/TestGyp.py
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+++ b/test/lib/TestGyp.py
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@@ -742,7 +742,7 @@ def FindVisualStudioInstallation():
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           build_tool = None
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       if not build_tool:
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         args1 = ['reg', 'query',
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-                    'HKLM\Software\Microsoft\VisualStudio\SxS\VS7',
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+                    r'HKLM\Software\Microsoft\VisualStudio\SxS\VS7',
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                     '/v', '15.0', '/reg:32']
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         build_tool = subprocess.check_output(args1).decode(
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             'utf-8', 'ignore').strip().split(b'\r\n').pop().split(b' ').pop()