关于python-dbus的问题

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pi@pi-102 /tmp $ python
Python 2.7.3 (default, Mar 18 2014, 05:13:23)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import dbus
>>> bus=dbus.SessionBus()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/dbus/_dbus.py", line 211, in __new__
    mainloop=mainloop)
File "/usr/lib/python2.7/dist-packages/dbus/_dbus.py", line 100, in __new__
    bus = BusConnection.__new__(subclass, bus_type, mainloop=mainloop)
File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 122, in __new__
    bus = cls._new_for_bus(address_or_type, mainloop=mainloop)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NotSupported: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11

如果没有配置DBUS_SESSION_BUS_ADDRESS环境变量将出现下面的错误：

Unable to autolaunch a dbus-daemon without a $DISPLAY for X11

解决方法：

export DBUS_SESSION_BUS_ADDRESS=`cat /tmp/omxplayerdbus.pi`

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