think python 第16章 classes and functions

16.1 time

16.2pure functions

编写两个函数，实现时间相加功能。

class Time(object): '''指代时间 属性：hour,minute,second''' time = Time() def add_time(t1,t2): sum = Time() sum.hour = t1.hour + t2.hour sum.minute = t1.minute + t2.minute sum.second = t1.second + t2.second　　 if sum.second >= 60:        sum.second -= 60        sum.minute += 1    if sum.minute >= 60:        sum.minute -= 60        sum.hour += 1 return sum def print_time(time): print("%.2d"% time.hour +":" + "%.2d"% time.minute + ":" + "%.2d"% time.second)

测试：

>>> s = Time() >>> s.hour = 9 >>> s.minute = 45 >>> s.second = 0 >>> dur = Time() >>> dur.hour = 1 >>> dur.minute = 35 >>> dur.second = 0 >>> done = add_time(s,dur) >>> print_time(done) 11:20:00

16.3modifiers

16.4prototyping versus planning(原型设计与计划)

其实就是将问题普遍化看似将问题复杂化，有时却简化了问题（因为特殊情况变少，出错概率也降低）

 

转载于:https://www.cnblogs.com/Kingwjk/p/8004465.html

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