Help pulling tkinter Entry string data

[Larz60+]

If y is within the confines of a class, and the StringVar is external from the method that it is used in,
both the definition of the variable and the use of same must reference self.

self.y = tk.StringVar()
SpeedInput = tk.Entry(root, textvariable = self.y)
speed = int(self.y.get())