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什么是异常:Python用异常对象(exception object)来表示异常情况.如果异常信息未被处理或捕捉。
程序就会用回潄来终止执行
>>> 1/0
Traceback (most recent call last): #Traceback: 一种错误信息
File "", line 1, in ?
ZeroDivisionError: integer division or modulo by zero
每个异常都是一些类的实例，这些实例可以被引发，并且可以用很...
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编程语言 时间：
2014-09-24 22:54:38
阅读次数：
350
-----QUESTION-----
Given n non-negative integers a1, a2,..., an,where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai)and (i,0). Find two lines, which together with x-axis forms ...
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其他好文 时间：
2014-09-24 20:39:27
阅读次数：
218
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
For example,
Given [0,1,0,2,1,0,1,3,2,1,2,1]...
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移动开发 时间：
2014-09-23 16:46:54
阅读次数：
224
One of the most exciting features of PHP 5.3 is the first-class support foranonymous functions. You may have heard them referred to asclosuresor lambd...
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Web程序 时间：
2014-09-23 12:11:34
阅读次数：
283
第二十六题（不会）The following is a simple program which implements a minimal version of banner command available on most *nix systems. Find out the logic use...
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其他好文 时间：
2014-09-23 09:02:44
阅读次数：
342
No matter how Microsoft is doing in comparison with Google, Microsoft Office is still the most used application in software world. Other alternatives ...
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编程语言 时间：
2014-09-22 20:04:23
阅读次数：
337
@staticmethod def instance(): """Returns a global `IOLoop` instance. Most applications have a single, global `IOLoop` running on ...
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其他好文 时间：
2014-09-22 14:36:42
阅读次数：
199
A semaphore initialized to one, and which is used such that it only has at most one permit available, can serve as a mutual exclusionlock.This is more...
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其他好文 时间：
2014-09-20 18:29:59
阅读次数：
251
最简单的DFS
Lake Counting
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 20516
Accepted: 10338
Description
Due to recent rains, water has pooled in various pla...
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其他好文 时间：
2014-09-20 10:08:07
阅读次数：
259
Implement pow(x, n).Analysis:The most basic idea, x multiply itself n time and return. However, this strait forward approach got time excessed. O(n).N...
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其他好文 时间：
2014-09-20 01:04:26
阅读次数：
207
