1. import time as t
    3. class MyTimer():
    4.     def __init__(self):
    5.         self.unit = ["年", "月", "天", "时", "分钟", "秒"]
    6.         self.prompt = "未开始计时"
    7.         self.lasted = []
    8.         self.begin = 0
    9.         self.end = 0
    10.     # 重写
    11.     def __str__(self):
    12.        return self.prompt
    14.     __repr__ = __str__
    16.     def __add__(self, other):
    17.         prompt = "总共运行了"
    18.         result =[]
    19.         for index in range(6):
    20.             result.append(self.lasted[index] + self.other.lasted[index])
    21.             if result[index]:
    22.                 prompt += (str(result[index]) +self.unit[index])
    23.         return prompt
    25.     # 开始计时
    26.     def start(self):
    27.         self.begin = t.localtime()
    28.         self.prompt ="提示: 请先调用stop() 停止计时"
    29.         print("开始计时...")
    31.     # 停止计时
    32.     def stop(self):
    33.         if not self.begin:
    34.             print("提示: 请先调用start() 运行计时")
    35.         else:
    36.             self.end = t.localtime()
    37.             self._calc()
    38.             print ("停止计时")
    40.     # 内部方法    计算运行时间  )前面使用下划线来区分 
    41.     def _calc(self):
    42.         self.lasted = []
    43.         self.prompt = "总共运行了"
    44.         for index in range(6):
    45.             self.lasted.append(self.end[index] - self.begin[index])
    46.             if self.lasted[index]:
    47.                 self.prompt += (str(self.lasted[index]) + self.unit[index])