# C = (F-32)/1.8# F = C*1.8+32+32# C表示摄氏温度 F表示华氏温度TempStr = input("请输入带有符号的温度值：")if TempStr[-1] in ['F','f']:    C = (eval(TempStr[0:-1])-32)/1.8    print("转换后的温度是{:.2f}C".format(C))elif TempStr[-1] in ['C','c']:    F = eval(TempStr[0:-1])*1.8+32    print("转换后的温度是{:.2f}F".format(F))else:    print("输入格式有误")