Update document

Author: aisk

Doc/library/winreg.rst

@@ -173,6 +173,27 @@ This module offers the following functions:
       See :ref:`above <exception-changed>`.
 
 
+.. function:: DeleteTree(key, sub_key=None)
+
+   Deletes the specified key and all its subkeys and values recursively.
+
+   *key* is an already open key, or one of the predefined
+   :ref:`HKEY_* constants <hkey-constants>`.
+
+   *sub_key* is a string that names the subkey to delete. If ``None``,
+   deletes all subkeys and values of the specified key.
+
+   This function deletes a key and all its descendants. If *sub_key* is
+   ``None``, all subkeys and values of the specified key are deleted.
+
+   If the function succeeds, the entire key tree is removed.
+   If the function fails, an :exc:`OSError` exception is raised.
+
+   .. audit-event:: winreg.DeleteTree key,sub_key winreg.DeleteTree
+
+   .. versionadded:: next
+
+
 .. function:: DeleteValue(key, value)
 
    Removes a named value from a registry key.