All classes now subclass object for better py3 compatibility

Fix #2147

_pytest/pytester.py

@@ -171,7 +171,7 @@ def _pytest(request):
     return PytestArg(request)
 
 
-class PytestArg:
+class PytestArg(object):
     def __init__(self, request):
         self.request = request
 
@@ -186,7 +186,7 @@ def get_public_names(values):
     return [x for x in values if x[0] != "_"]
 
 
-class ParsedCall:
+class ParsedCall(object):
     def __init__(self, name, kwargs):
         self.__dict__.update(kwargs)
         self._name = name
@@ -197,7 +197,7 @@ class ParsedCall:
         return "<ParsedCall %r(**%r)>" % (self._name, d)
 
 
-class HookRecorder:
+class HookRecorder(object):
     """Record all hooks called in a plugin manager.
 
     This wraps all the hook calls in the plugin manager, recording each call
@@ -343,7 +343,7 @@ def testdir(request, tmpdir_factory):
 rex_outcome = re.compile(r"(\d+) ([\w-]+)")
 
 
-class RunResult:
+class RunResult(object):
     """The result of running a command.
 
     Attributes:
@@ -397,7 +397,7 @@ class RunResult:
         assert obtained == dict(passed=passed, skipped=skipped, failed=failed, error=error)
 
 
-class CwdSnapshot:
+class CwdSnapshot(object):
     def __init__(self):
         self.__saved = os.getcwd()
 
@@ -405,7 +405,7 @@ class CwdSnapshot:
         os.chdir(self.__saved)
 
 
-class SysModulesSnapshot:
+class SysModulesSnapshot(object):
     def __init__(self, preserve=None):
         self.__preserve = preserve
         self.__saved = dict(sys.modules)
@@ -418,7 +418,7 @@ class SysModulesSnapshot:
         sys.modules.update(self.__saved)
 
 
-class SysPathsSnapshot:
+class SysPathsSnapshot(object):
     def __init__(self):
         self.__saved = list(sys.path), list(sys.meta_path)
 
@@ -426,7 +426,7 @@ class SysPathsSnapshot:
         sys.path[:], sys.meta_path[:] = self.__saved
 
 
-class Testdir:
+class Testdir(object):
     """Temporary test directory with tools to test/run pytest itself.
 
     This is based on the ``tmpdir`` fixture but provides a number of methods
@@ -740,7 +740,7 @@ class Testdir:
 
             rec = []
 
-            class Collect:
+            class Collect(object):
                 def pytest_configure(x, config):
                     rec.append(self.make_hook_recorder(config.pluginmanager))
 
@@ -750,7 +750,7 @@ class Testdir:
             if len(rec) == 1:
                 reprec = rec.pop()
             else:
-                class reprec:
+                class reprec(object):
                     pass
             reprec.ret = ret
 
@@ -780,13 +780,13 @@ class Testdir:
                 reprec = self.inline_run(*args, **kwargs)
             except SystemExit as e:
 
-                class reprec:
+                class reprec(object):
                     ret = e.args[0]
 
             except Exception:
                 traceback.print_exc()
 
-                class reprec:
+                class reprec(object):
                     ret = 3
         finally:
             out, err = capture.readouterr()
@@ -1067,7 +1067,7 @@ def getdecoded(out):
             py.io.saferepr(out),)
 
 
-class LineComp:
+class LineComp(object):
     def __init__(self):
         self.stringio = py.io.TextIO()
 
@@ -1085,7 +1085,7 @@ class LineComp:
         return LineMatcher(lines1).fnmatch_lines(lines2)
 
 
-class LineMatcher:
+class LineMatcher(object):
     """Flexible matching of text.
 
     This is a convenience class to test large texts like the output of