import time
print(" ------------------------------计算器------------------------------")
start_time = time.time()
formula = input("请输入算式:")
elapsed_time = time.time() - start_time
elapsed_times = elapsed_time / 10000
print(f"计算中···预计用时约:{elapsed_times}秒")
middle_time = time.time()
result = eval(formula);time.sleep(0.01)
end_time = time.time() - middle_time - 0.01
print(f"计算成功！结果:{result}")
print(f"实际用时:{end_time}秒")
time.sleep(3)