摘要：背景上的一道原题，通过格式划字符串精简了代码结构，省去了很多条件判断语句。题目描述解题思路题目是很简单的，关键是如何优雅地完成是否在当前时间单位后添加和或者，我的代码里运用了很多语句。代码感想表达式真是一个神器。
背景
CodeWar上的一道原题，通过格式划字符串精简了代码结构，省去了很多条件判断语句。
题目描述Your task in order to complete this Kata is to write a function which formats a duration, given as a number of seconds, in a human-friendly way.
The function must accept a non-negative integer. If it is zero, it just returns "now". Otherwise, the duration is expressed as a combination of years, days, hours, minutes and seconds.
It is much easier to understand with an example:
format_duration(62) # returns "1 minute and 2 seconds"
format_duration(3662) # returns "1 hour, 1 minute and 2 seconds"
Note that spaces are important.
Detailed rulesThe resulting expression is made of components like 4 seconds, 1 year, etc. In general, a positive integer and one of the valid units of time, separated by a space. The unit of time is used in plural if the integer is greater than 1.
The components are separated by a comma and a space (", "). Except the last component, which is separated by " and ", just like it would be written in English.
A more significant units of time will occur before than a least significant one. Therefore, 1 second and 1 year is not correct, but 1 year and 1 second is.
Different components have different unit of times. So there is not repeated units like in 5 seconds and 1 second.
A component will not appear at all if its value happens to be zero. Hence, 1 minute and 0 seconds is not valid, but it should be just 1 minute.
A unit of time must be used "as much as possible". It means that the function should not return 61 seconds, but 1 minute and 1 second instead. Formally, the duration specified by of a component must not be greater than any valid more significant unit of time.
For the purpose of this Kata, a year is 365 days and a day is 24 hours.
解题思路题目是很简单的，关键是如何优雅地完成是否在当前时间单位后添加"s"和","或者"and"，我的代码里运用了很多
true_value if condition else false_value
语句。
代码def format_duration(seconds):
if seconds == 0: return "now"
origin = seconds
dic = {
"year": 60 * 60 * 24 * 365,
"day": 60 * 60 * 24,
"hour": 60 * 60,
"minute": 60,
"second": 1
}
spent = {}
ans = ""
for x in ["year","day","hour","minute","second"]:
spent[x] = seconds // dic[x]
ans += "{}{} {}{}".format("" if seconds == origin else " and " if seconds % dic[x] == 0 else ", ",spent[x],x,"s" if spent[x] > 1 else "") if spent[x] > 0 else ""
seconds %= dic[x]
return ans
感想
if else 表达式真是一个神器。
文章版权归作者所有，未经允许请勿转载,若此文章存在违规行为，您可以联系管理员删除。
转载请注明本文地址：https://www.ucloud.cn/yun/38128.html
摘要：是一个非常简单的库，用来格式化数字，变成可读的格式，可以自定义格式。万高级自定义通过自定义，可以将文件数时间间隔等数字格式化成自己想要的格式。可以随意自己定义语言和样式。 hrn is short for Human Readable Number, a simple javascript for browserjs / nodejs library to format number ...
此篇文章主要是给大家介绍了python深度神经网络tensorflow练习好一点的实体模型开展图像分类实例详细说明，感兴趣的小伙伴可以参考借鉴一下，希望可以有一定的帮助，祝愿大家多多的发展，尽早涨薪。 文章正文 Google在各类图象数据库系统ImageNet上练习好啦1个Inception-v3实体模型，这一实体模型大家也可以用来进去图像分类。 下载地址:https://pan.bai...
摘要：项目地址时间和日期可能涉及到不同的时区格式，同时又经常需要作为时间戳保存，有时候还需要进行一些加减操作，因此处理起来通常会因为方法太多而无从下手。中与时间和日期相关的标准库有个和。 项目地址：https://git.io/pytips 时间和日期可能涉及到不同的时区、格式，同时又经常需要作为时间戳保存，有时候还需要进行一些加减操作，因此处理起来通常会因为方法太多而无从下手。Python...
摘要：是实现网格视图的小部件，一般用于报表视图的展示。就是连续的列，主要用于网格的行号，属于自增式的列。指定处理的类，必须。 Yii2 GridView是实现yii网格视图的小部件，一般用于报表视图的展示。今天，结合DataProvider（ArrayDataProvider以及SqlDataProvider）说一下GridView中的几个Columns(SerialColumn,DataC...
摘要：截止到月号上午点，将终结于在这一段时间中，很多优秀开源项目与库已经停止了对的支持。除了，还提供了一种通过进行字符串插入的灵活方法。扩展的可迭代对象解包最低版本为对于这个特性，代码就说明了一切。从 3.0 到 3.8，Python 3 已经更新了一波又一波，但似乎我们用起来和 2.7 没有太大区别？以前该怎么写 2.7 的代码现在就怎么写，只不过少数表达方式变了而已。在这篇文章中，作者介绍了 ...
阅读 1733·2021-09-09 09:33
阅读 973·2019-08-30 15:43
阅读 2475·2019-08-30 13:45
阅读 3172·2019-08-29 11:00
阅读 592·2019-08-26 14:01
阅读 3449·2019-08-26 13:24
阅读 334·2019-08-26 11:56
阅读 2549·2019-08-26 10:27
