macOS nowplaying implemented in pyobjc

main.py

from Foundation import NSRunLoop, NSMutableDictionary, NSObject                                                               
from MediaPlayer import MPRemoteCommandCenter, MPNowPlayingInfoCenter                                                         
from MediaPlayer import (                                                                                                     
    MPMediaItemPropertyTitle, MPMediaItemPropertyArtist,                                                                      
    MPMusicPlaybackState, MPMusicPlaybackStatePlaying, MPMusicPlaybackStatePaused                                             
)                                                                                                                             
                                                                                                                              
                                                                                                                              
class NowPlaying:                                                                                                             
    def __init__(self):                                                                                                       
        self.cmd_center = MPRemoteCommandCenter.sharedCommandCenter()                                                         
        self.info_center = MPNowPlayingInfoCenter.defaultCenter()                                                             
                                                                                                                              
        cmds = [                                                                                                              
            self.cmd_center.togglePlayPauseCommand(),                                                                         
            self.cmd_center.playCommand(),                                                                                    
            self.cmd_center.pauseCommand(),                                                                                   
        ]                                                                                                                     
                                                                                                                              
        for cmd in cmds:                                                                                                      
            cmd.addTargetWithHandler_(self._create_handler(cmd))                                                              
                                                                                                                              
        self.update_info()                                                                                                    
                                                                                                                              
    def update_info(self):                                                                                                    
        nowplaying_info = NSMutableDictionary.dictionary()                                                                    
        nowplaying_info[MPMediaItemPropertyTitle] = "title"                                                                   
        nowplaying_info[MPMediaItemPropertyArtist] = "artist"                                                                 
        self.info_center.setNowPlayingInfo_(nowplaying_info)                                                                  
        self.info_center.setPlaybackState_(MPMusicPlaybackStatePlaying)                                                       
                                                                                                                              
                                                                                                                              
    def _create_handler(self, cmd):                                                                                           
                                                                                                                              
        def handle(event):                                                                                                    
            if event.command() == self.cmd_center.pauseCommand():                                                             
                self.info_center.setPlaybackState_(MPMusicPlaybackStatePaused)                                                
            elif event.command() == self.cmd_center.playCommand():                                                            
                self.info_center.setPlaybackState_(MPMusicPlaybackStatePlaying)                                               
            return 0                                                                                                          
                                                                                                                              
        return handle                                                                                                         
                                                                                                                              
                                                                                                                              
def runloop():                                                                                                                
    """                                                                                                                       
    HELP: This function can't be called in non-main thread.                                                                   
    """                                                                                                                       
    nowplaying = NowPlaying()                                                                                                 
    NSRunLoop.mainRunLoop().run()                                                                                             
                                                                                                                              
                                                                                                                              
runloop() 

Screenshot