from tkinter import *
win = Tk()
win.geometry("400x400")
def huoqu(event):
data = e.get()
zujian.configure(text="运算结果为:"+str(eval(data)))
biaot = Label(text="请输入表达式")
biaot.pack()
e = Entry(win)
e.bind("<Return>",huoqu)
e.pack()
zujian = Label(win)
zujian.pack()
win.mainloop()
运行成果如下:
输入表达式后,回车执行、