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import easygui


a = 0
s = 0
while True:
    try:
        e1 = int(easygui.enterbox("请输入第一个数字："))
        e2 = int(easygui.enterbox("请输入第二个数字："))
    except (Exception):
        break
    else:
        c1 = easygui.buttonbox("请选择运算符：",choices=["+","-","*","/"])
        if c1 == "+":
            a = e1 + e2
        elif c1 == "-":
            a = e1 - e2
        elif c1 == "*":
            a = e1 * e2
        elif c1 == "/":
            a = e1 / e2
        if s == 1:
            c1 = easygui.buttonbox("请选择几个数的运算符：", choices=["+", "-", "*", "/"])
            if c1 == "+":
                a += e1 + e2
            elif c1 == "-":
                a += e1 - e2
            elif c1 == "*":
                a += e1 * e2
            elif c1 == "/":
                a += e1 / e2
                
        c = easygui.ynbox("您想要继续吗？")
        if c == True:
            s = 1
        else:
            break
easygui.msgbox("最后的计算结果是："+str(a))