Issue #16706: get rid of os.error

Lib/posixpath.py

@@ -162,7 +162,7 @@ def islink(path):
     """Test whether a path is a symbolic link"""
     try:
         st = os.lstat(path)
-    except (os.error, AttributeError):
+    except (OSError, AttributeError):
         return False
     return stat.S_ISLNK(st.st_mode)
 
@@ -172,7 +172,7 @@ def lexists(path):
     """Test whether a path exists.  Returns True for broken symbolic links"""
     try:
         os.lstat(path)
-    except os.error:
+    except OSError:
         return False
     return True
 
@@ -220,7 +220,7 @@ def ismount(path):
         else:
             parent = join(path, '..')
         s2 = os.lstat(parent)
-    except os.error:
+    except OSError:
         return False # It doesn't exist -- so not a mount point :-)
     dev1 = s1.st_dev
     dev2 = s2.st_dev