[Python] Tkinter Toplevel TypeError

I am trying to create a new TopLevel through a button command, however, I am having some difficulty. With the following code:

initial_state_button = Button(current_state, text=current_state_text, command = partial(initial_state_display, aatsplusv))
initial_state_button.pack(side = TOP)

....

def initial_state_display(dictionary):

top = Toplevel()
top.title = "About this State:"

count = 0
for key, value in dictionary["initial states"].iteritems():
proposition = Message(top, text = key)
proposition.grid(row=count, column=0, padx=5, pady=5)
colon = Message(top, text = " : ")
colon.grid(row=count, column=1, padx=5, pady=5)
boolean = Message(top, text = str(value))
colon.grid(row=count, column=2, padx=5, pady=5)
count += 1


I receive the following error:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python27\lib\lib-tk\Tkinter.py", line 1536, in __call__ return self.func(*args)
File "Assignmentest.py", line 400, in initial_state_display top = Toplevel()
File "C:\Python27\lib\lib-tk\Tkinter.py", line 2136, in __init__ self.title(root.title())
TypeError: 'str' object is not callable


I have no clue what is wrong. top = Toplevel is written exactly how the effbot example shows. Is toplevel not available in Python 2.7? If so, is there an 2.7 equivalent?

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