win32con is missing many virtual keycode constants:

# from WinUser.h
win32con.MOUSEEVENTF_XDOWN = 0x0080
win32con.MOUSEEVENTF_XUP = 0x0100
win32con.MOUSEEVENTF_WHEEL = 0x0800
win32con.VK_XBUTTON1 = 0x05
win32con.VK_XBUTTON2 = 0x06
win32con.VK_VOLUME_MUTE = 0xAD
win32con.VK_VOLUME_DOWN = 0xAE
win32con.VK_VOLUME_UP = 0xAF
win32con.VK_MEDIA_NEXT_TRACK = 0xB0
win32con.VK_MEDIA_PREV_TRACK = 0xB1
win32con.VK_MEDIA_PLAY_PAUSE = 0xB3
win32con.VK_BROWSER_BACK = 0xA6
win32con.VK_BROWSER_FORWARD = 0xA7