[Python] I continue to get the error: " TypeError: 'str' object is not callable " when...

This is what I currently have. Whenever I press the button at the bottom, it gets the error and the window stays blank. The error also says

tennis_window = Toplevel()
File "C:\Python27\lib\lib-tk\Tkinter.py", line 2136, in __init__self.title(root.title())


which I don't understand, also apologies, this is my first post so please let me know if i can clarify anything

#Create the main window
Main_Window = Tk()

#Main window title
Main_Window.title = ('Top Ten')

#Converting to photo image
Top_Ten_Pic = gif_to_PhotoImage(urlopen('random gif image url').read())

#Converting to photo image
Tennis_pic = (urlopen('random gif image url').read())


#Create a label to display the downloaded image
top_ten_label = Label(Main_Window, image = Top_Ten_Pic, height = 280,
width = 400)
top_ten_label.grid(row=0,column=0, columnspan = 3)

#command for top ten tennis window
def button_tennis():

#new toplevel window
tennis_window = Toplevel()

#title the window
tennis_window.title = ('Top Ten Tennis')


#Create a label to display the downloaded image
top_ten_label = Label(tennis_window, image = Tennis_pic, height = 280,
width = 400)
top_ten_label.grid(row=0,column=0, columnspan = 3)

#start the windows event loop
top_tennis.mainloop()

#Top ten tennis button (mainwindow)
tennis_button = Button(Main_Window, text = 'Top Ten Tennis', font =
('Times New Roman', 12), command = button_tennis)
tennis_button.grid(row = 1, column = 0)


Main_Window.mainloop()

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