from Tkinter import *from math import *def calc(): result = "= " + str(eval(expression.get())) label.config(text = result)root = Tk()frame = Frame(root)label = Label(frame)entry = Entry(frame)expression = StringVar()entry["textvariable"] = expression button = Button(frame, text = "=", command = calc)frame.pack()entry.pack()label.pack(side=LEFT)button.pack(side=RIGHT)frame.mainloop()
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