small refactoring

1 files changed, 7 insertions, 6 deletions

diff --git a/psutil/_compat.py b/psutil/_compat.py
index 07ab909a..bd8e99f9 100644
--- a/psutil/_compat.py
+++ b/psutil/_compat.py
@@ -54,6 +54,7 @@ if PY3:
 else:
     # https://github.com/PythonCharmers/python-future/blob/exceptions/
     #     src/future/types/exceptions/pep3151.py
+    _singleton = object()
 
     def instance_checking_exception(base_exception=Exception):
         def wrapped(instance_checker):
@@ -84,28 +85,28 @@ else:
 
     @instance_checking_exception(EnvironmentError)
     def FileNotFoundError(inst):
-        return getattr(inst, 'errno', object()) == errno.ENOENT
+        return getattr(inst, 'errno', _singleton) == errno.ENOENT
 
     @instance_checking_exception(EnvironmentError)
     def ProcessLookupError(inst):
-        return getattr(inst, 'errno', object()) == errno.ESRCH
+        return getattr(inst, 'errno', _singleton) == errno.ESRCH
 
     @instance_checking_exception(EnvironmentError)
     def PermissionError(inst):
-        return getattr(inst, 'errno', object()) in (
+        return getattr(inst, 'errno', _singleton) in (
             errno.EACCES, errno.EPERM)
 
     @instance_checking_exception(EnvironmentError)
     def InterruptedError(inst):
-        return getattr(inst, 'errno', object()) == errno.EINTR
+        return getattr(inst, 'errno', _singleton) == errno.EINTR
 
     @instance_checking_exception(EnvironmentError)
     def ChildProcessError(inst):
-        return getattr(inst, 'errno', object()) == errno.ECHILD
+        return getattr(inst, 'errno', _singleton) == errno.ECHILD
 
     @instance_checking_exception(EnvironmentError)
     def FileExistsError(inst):
-        return getattr(inst, 'errno', object()) == errno.EEXIST
+        return getattr(inst, 'errno', _singleton) == errno.EEXIST
 
 
 # --- stdlib additions