ttp://support.microsoft.com/kb/290150/ja

import ctypes
import time

TOGGLE_HIDEWINDOW = 0x80
TOGGLE_UNHIDEWINDOW = 0x40

FindWindowW = ctypes.windll.user32.FindWindowW
SetWindowPos = ctypes.windll.user32.SetWindowPos

hwnd = FindWindowW(u"Shell_traywnd", u"")
SetWindowPos(hwnd, 0, 0, 0, 0, 0, TOGGLE_HIDEWINDOW)
time.sleep(2.0)
SetWindowPos(hwnd, 0, 0, 0, 0, 0, TOGGLE_UNHIDEWINDOW)