[Python] Python: How do i store a text input from the user on Tkinter?

This is what i tried so far to get the user's input:

master = Tk()
master.title('Title')

v = StringVar()

L1 = Label(master, text = 'Name')
L1.pack(side = LEFT)

E1 = Entry(master, textvariable = v, bd = 5)
E1.pack(side = RIGHT)

def userinput():
a = raw_input(v.get())
print a


b = Button(master, text = 'Submit', command = userinput)
b.pack(side = BOTTOM)


master.mainloop()


The real question is, how can i store the v.get() raw_input into a variable outside the function? Thx!

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