hot-backup.py: Modernize Python syntax.

* tools/backup/hot-backup.py.in: Drop syntaxes unsupported by ≥py3.0, while
    retaining compatibility with ≥py2.6.  (Both trunk and 1.9.x require ≥py2.7.)


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1721179 13f79535-47bb-0310-9956-ffa450edef68

tools/backup/hot-backup.py.in

@@ -70,7 +70,7 @@ def chmod_tree(path, mode, mask):
 def safe_rmtree(dirname, retry=0):
   "Remove the tree at DIRNAME, making it writable first"
   def rmtree(dirname):
-    chmod_tree(dirname, 0666, 0666)
+    chmod_tree(dirname, 0o666, 0o666)
     shutil.rmtree(dirname)
 
   if not os.path.exists(dirname):
@@ -117,7 +117,7 @@ try:
                                                       "num-backups=",
                                                       "verify",
                                                       "help"])
-except getopt.GetoptError, e:
+except getopt.GetoptError as e:
   sys.stderr.write("ERROR: %s\n\n" % e)
   sys.stderr.flush()
   usage(sys.stderr)
@@ -231,7 +231,7 @@ print("Beginning hot backup of '"+ repo_dir + "'.")
 
 try:
   youngest = get_youngest_revision()
-except Exception, e:
+except Exception as e:
   sys.stderr.write("%s\n" % e)
   sys.stderr.flush()
   sys.exit(1)
@@ -299,10 +299,10 @@ if archive_type:
       tar = tarfile.open(archive_path, 'w:' + archive_type)
       tar.add(backup_subdir, os.path.basename(backup_subdir))
       tar.close()
-    except ImportError, e:
+    except ImportError as e:
       err_msg = "Import failed: " + str(e)
       err_code = -2
-    except tarfile.TarError, e:
+    except tarfile.TarError as e:
       err_msg = "Tar failed: " + str(e)
       err_code = -3
 
@@ -325,10 +325,10 @@ if archive_type:
       for dirpath, dirs, files in os.walk(backup_subdir):
         add_to_zip(zp, backup_dir, dirpath, dirs + files)
       zp.close()
-    except ImportError, e:
+    except ImportError as e:
       err_msg = "Import failed: " + str(e)
       err_code = -4
-    except zipfile.error, e:
+    except zipfile.error as e:
       err_msg = "Zip failed: " + str(e)
       err_code = -5