diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index 06e0b88..7670120 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -783,7 +783,7 @@
         # needs amendment
         if not isinstance(self.cv, ScrolledCanvas):
             return self.canvwidth, self.canvheight
-        if canvwidth is None and canvheight is None and bg is None:
+        if canvwidth is canvheight is bg is None:
             return self.cv.canvwidth, self.cv.canvheight
         if canvwidth is not None:
             self.canvwidth = canvwidth
@@ -999,7 +999,7 @@
         >>> mode()
         'logo'
         """
-        if mode == None:
+        if mode is None:
             return self._mode
         mode = mode.lower()
         if mode not in ["standard", "logo", "world"]:
@@ -1339,7 +1339,7 @@
         ### repeatedly pressing the up-arrow key,
         ### consequently drawing a hexagon
         """
-        if fun == None:
+        if fun is None:
             if key in self._keys:
                 self._keys.remove(key)
         elif key not in self._keys:
@@ -1460,7 +1460,7 @@
     def _setmode(self, mode=None):
         """Set turtle-mode to 'standard', 'world' or 'logo'.
         """
-        if mode == None:
+        if mode is None:
             return self._mode
         if mode not in ["standard", "logo", "world"]:
             return
@@ -2704,7 +2704,7 @@
         >>> turtle.shapesize(5, 5, 12)
         >>> turtle.shapesize(outline=8)
         """
-        if stretch_wid is None and stretch_len is None and outline == None:
+        if stretch_wid is stretch_len is outline is None:
             stretch_wid, stretch_len = self._stretchfactor
             return stretch_wid, stretch_len, self._outlinewidth
         if stretch_wid is not None:
diff --git a/Lib/macpath.py b/Lib/macpath.py
index 15714c6..b22759e 100644
--- a/Lib/macpath.py
+++ b/Lib/macpath.py
@@ -206,7 +206,10 @@
     path = components[0] + ':'
     for c in components[1:]:
         path = join(path, c)
-        path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
+        try:
+            path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
+        except Carbon.File.Error:
+            pass
     return path
 
 supports_unicode_filenames = False
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 7077787..cb55b47 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -399,11 +399,6 @@
             if module not in save_modules and module.startswith("test."):
                 test_support.unload(module)
 
-    # The lists won't be sorted if running with -r
-    good.sort()
-    bad.sort()
-    skipped.sort()
-
     if good and not quiet:
         if not bad and not skipped and len(good) > 1:
             print "All",
@@ -757,7 +752,8 @@
 
     from textwrap import fill
     blanks = ' ' * indent
-    print fill(' '.join(map(str, x)), width,
+    # Print the sorted list: 'x' may be a '--random' list or a set()
+    print fill(' '.join(str(elt) for elt in sorted(x)), width,
                initial_indent=blanks, subsequent_indent=blanks)
 
 # Map sys.platform to a string containing the basenames of tests
diff --git a/Lib/test/test_warnings.py b/Lib/test/test_warnings.py
index 71944cd..fab8086 100644
--- a/Lib/test/test_warnings.py
+++ b/Lib/test/test_warnings.py
@@ -37,11 +37,15 @@
     except NameError:
         pass
     original_warnings = warning_tests.warnings
+    original_filters = module.filters
     try:
+        module.filters = original_filters[:]
+        module.simplefilter("once")
         warning_tests.warnings = module
         yield
     finally:
         warning_tests.warnings = original_warnings
+        module.filters = original_filters
 
 
 class BaseTest(unittest.TestCase):
@@ -204,6 +208,7 @@
     def test_message(self):
         with original_warnings.catch_warnings(record=True,
                 module=self.module) as w:
+            self.module.simplefilter("once")
             for i in range(4):
                 text = 'multi %d' %i  # Different text on each call.
                 self.module.warn(text)
diff --git a/Misc/NEWS b/Misc/NEWS
index ea0ebb4..ee23d24 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -23,6 +23,8 @@
 Library
 -------
 
+- Issue #8179: Fix macpath.realpath() on a non-existing path.
+
 - Issue #7667: Fix doctest failures with non-ASCII paths.
 
 - Issue #7624: Fix isinstance(foo(), collections.Callable) for old-style