NSUserNotificationCenter.defaultUserNotificationCenter()在python中返回None

Question

我正在尝试通过python连接到Mountain Lion通知中心。我已经安装了pyobjc，并且正在遵循here和here的说明。另请参阅：Working with Mountain Lion's Notification Center using PyObjC

下面是我的代码：

import Foundation, objc
import AppKit
import sys

NSUserNotification = objc.lookUpClass('NSUserNotification')
NSUserNotificationCenter = objc.lookUpClass('NSUserNotificationCenter')

def notify(title, subtitle, info_text, delay=0, sound=False, userInfo={}):
    """ Python method to show a desktop notification on Mountain Lion. Where:
        title: Title of notification
        subtitle: Subtitle of notification
        info_text: Informative text of notification
        delay: Delay (in seconds) before showing the notification
        sound: Play the default notification sound
        userInfo: a dictionary that can be used to handle clicks in your
                  app's applicationDidFinishLaunching:aNotification method
    """
    notification = NSUserNotification.alloc().init()
    notification.setTitle_(title)
    notification.setSubtitle_(subtitle)
    notification.setInformativeText_(info_text)
    notification.setUserInfo_(userInfo)
    if sound:
        notification.setSoundName_("NSUserNotificationDefaultSoundName")
    notification.setDeliveryDate_(Foundation.NSDate.dateWithTimeInterval_sinceDate_(delay, Foundation.NSDate.date()))
    NSUserNotificationCenter.defaultUserNotificationCenter().scheduleNotification_(notification)

当我调用带有参数的notify函数时，我得到一个属性错误：

AttributeError: 'NoneType' object has no attribute 'scheduleNotification_'

我不明白为什么NSUserNotificationCenter.defaultUserNotificationCenter()要返回一个NoneType对象。我还没能在互联网上对这件事提出任何疑问。

Answer 1

因此，使用Ned的建议使用默认python可以很好地工作。当我将pyobjc安装在32位的installed发行版上时，它也能正常工作。在我看来，pyobjc只适用于32位的python发行版(我不能证实这一点，但到目前为止似乎是这样的)。

(注意:当我发布这个问题时，我已经将pyobjc安装到了64位的installed发行版上)。