Nsryjdtyk

I am trying to current playing track name from Spotify desktop app window title by using subprocess. In generally, my code is working. But when trying to retrieve song name each five second, i get RecursionError. Where is the problem?

Code1

def title_of_window(self,window_class):

    """

        Retrieves the title of application by through 'subprocess'.



        Params:

            window_class (string) -- name of the application to be taken the title

                ex. --> spotify

                    --> filezilla

                    --> putty

                    --> atom



        For this app:

            - window_class parameter must be equal to "spotify"

            - Retrieves the current playing song name from Spotify.



    """

    # Finds id of all GUI apps who running.

    # Ex. -> ['0x200000a', '0x3800007', '0x4800001', '0x2e00010', '0x3600001n']

    active_windows = subprocess.Popen(["xprop",

                                       "-root",

                                       "_NET_CLIENT_LIST_STACKING"],

                                       stdout=subprocess.PIPE).communicate()

    active_windows_ids = active_windows[0].decode("utf-8").split("# ")[1].split(", ")

    #

    # Sends all ids to 'xprop -id' and checks. If app name equal to window_class parameter, return title of this app.

    # Ex. -> get_window.py — ~/Desktop/projects — Atom

    for active_id in active_windows_ids:

        window = subprocess.Popen(["xprop",

                                    "-id",

                                    active_id.strip(),

                                    "WM_CLASS",

                                    "_NET_WM_NAME"],

                                    stdout=subprocess.PIPE).communicate()

        window = window[0].decode("utf-8").split('"')

        if window_class == window[3].lower():

            return window[5]

Mainloop

def run(self):

    song = self.title_of_window(self.SPOTIFY)

    if self.temp_song_name != song:

        lyric = self.get_lyric(song)

        self.add_lyric_to_tk(song,lyric)

    else:

        self.add_lyric_to_tk(song, "Not Found")

    self.top.after(5000,self.run)

    self.top.mainloop()

Error:

File "spotifyLyric.py", line 137, in run

    song = self.title_of_window(self.SPOTIFY)

File "spotifyLyric.py", line 51, in title_of_window

    stdout=subprocess.PIPE).communicate()

RecursionError: maximum recursion depth exceeded while calling a Python object

The problem is that you're calling self.top.mainloop() multiple times. You should be able to fix the error by moving the call to self.top.mainloop() into your __init__() method.

def __init__(self):

    ...

    self.run()

    self.top.mainloop()



def run(self):

    song = self.title_of_window(self.SPOTIFY)

    if self.temp_song_name != song:

        lyric = self.get_lyric(song)

        self.add_lyric_to_tk(song,lyric)

    else:

        self.add_lyric_to_tk(song, "Not Found")

    self.top.after(5000,self.run)

Does this solve your problem?

EDIT: see here for a longer description of the problem.