How can I add a new option to an inherited tkinter Frame class?
The problem is that you use kwargs not only in the for photo loop but also pass it to the init of tkinter.Frame in
tkinter.Frame.__init__(self, master, *args, **kwargs)For tkinter.Frame photos is not a valid keyword argument and therefore the whole thing fails. A potential solution would be
class SlideShow(tkinter.Frame): def __init__(self, master=None,photo_urls=[], *args, **kwargs): tkinter.Frame.__init__(self, master, *args, **kwargs) self.master = master self.grid() self.photos = [] for url in photo_urls: self.photos.append(ImageTk.PhotoImage(Image.open(io.BytesIO(urlopen(url).read())))) self.label_photo = tkinter.Label(self, image=self.photos[0]) self.label_photo.photo = self.photos[0] self.label_photo.grid(column=1, row=1)Make however shure that your code works also for an empty list of photos.