翻译强力驱动How can you fade in and/or out on a Tkinter.Frame or any other widget for that matter. All of the examples that I have seen have been for either root (Tkinter.Tk) or Toplevel setting the alpha e.g.
https://stackoverflow.com/a/22491808/1552953
Is it possible to apply this to an individual widget?
You can't do it on individual widgets. Transparency in Tkinter is only available for instances of Tk and Toplevel.
Based on Bryan's answer I came up with this solution, which he inadvertently provided most of the code for also.
One thing to note is if you move the main window the toplevel doesn't move with it...
import Tkinter import Queue class Flash(Tkinter.Toplevel): def __init__(self, root, **options): Tkinter.Toplevel.__init__(self, root, width=100, height=20, **options) self.overrideredirect(True) # remove header from toplevel self.root = root self.attributes("-alpha", 0.0) # set transparency to 100% self.queue = Queue.Queue() self.update_me() def write(self, message): self.queue.put(message) # insert message into the queue def update_me(self): #This makes our tkinter widget threadsafe # http://effbot.org/zone/tkinter-threads.htm try: while 1: message = self.queue.get_nowait() # get message from the queue # if a message is received code will execute from here otherwise exception # http://stackoverflow.com/questions/11156766/placing-child-window-relative-to-parent-in-tkinter-pythons x = root.winfo_rootx() # set x coordinate of root y = root.winfo_rooty() # set y coordinate of root width = root.winfo_width() # get the width of root self.geometry("+%d+%d" % (x+width-self.winfo_width() ,y)) # place in the top right cornder of root self.fade_in() # fade in when a message is received label_flash = Tkinter.Label(self, text=message, bg='black', fg='white', padx=5, pady=5) label_flash.pack(anchor='e') self.lift(self.root) def callback(): label_flash.after(2000, label_flash.destroy) # destroy the label after 5 seconds self.fade_away() # fade away after 3 seconds label_flash.after(3000, callback) except Queue.Empty: pass self.after(100, self.update_me) # check queue every 100th of a second # http://stackoverflow.com/questions/3399882/having-trouble-with-tkinter-transparency def fade_in(self): alpha = self.attributes("-alpha") alpha = min(alpha + .01, 1.0) self.attributes("-alpha", alpha) if alpha < 1.0: self.after(10, self.fade_in) # http://stackoverflow.com/questions/22491488/how-to-create-a-fade-out-effect-in-tkinter-my-code-crashes def fade_away(self): alpha = self.attributes("-alpha") if alpha > 0: alpha -= .1 self.attributes("-alpha", alpha) self.after(10, self.fade_away) if __name__ == '__main__': root = Tkinter.Tk() root.minsize(700, 300) root.geometry("700x500") flash = Flash(root) # create toplevel instance def callback(): # put a delay between each message so we can check the behaviour depending on the lenght of the delay between messages import time flash.write('Hello World') time.sleep(1) flash.write('Ready!') time.sleep(2) flash.write('Steady!') time.sleep(4) flash.write('Go!') # create a thread to prevent the delays from blocking our GUI import threading t = threading.Thread(target=callback) t.daemon = True t.start() root.mainloop() exit()