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difference between primary key and unique key
... there are so many physical entities (such as people, resources, machines, etc.) and virtual entities (their Tasks, transactions, activities).
Typically, business needs to record and process information of those business entities.
These business entities are identified within a whole business doma...
Python: Tuples/dictionaries as keys, select, sort
... 'blue'])
for k in blue_fruit:
print k[0], data[k] # prints 'banana 24', etc
Sorting works because tuples have natural ordering if their components have natural ordering.
With keys as rather full-fledged objects, you just filter by k.color == 'blue'.
You can't really use dicts as keys, but yo...
How should I handle “No internet connection” with Retrofit on Android
...pter
RestAdapter.Builder().setEndpoint(serverHost)
.setClient(new ConnectivityAwareUrlClient(new OkHttpClient(), ...))
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上线当天App就崩了，才发问题是手机网络超时没处理——用App Inventor 2的W...
上周五晚上，朋友老刘急匆匆给我发消息："我的查价App上线两天，应用商店差评炸了，用户说一打开就白屏。"
我让他把项目发过来看了看。好家伙——屏幕上拖了个Web组件，按钮点击直接执行GET请求，没有任何超时...
Queue.Queue vs. collections.deque
...ation.
In fact the heavy usage of an extra mutex and extra method ._get() etc. method calls in Queue.py is due to backwards compatibility constraints, past over-design and lack of care for providing an efficient solution for this important speed bottleneck issue in inter-thread communication. A lis...
How do I check if a list is empty?
...already an array, or wraps your input into an array if it's a list, tuple, etc., and optionally converts it to your chosen dtype. So it's very quick whenever it can be, and it ensures that you just get to assume the input is a NumPy array. We usually even just use the same name, as the conversion ...
Regular expression to allow spaces between words
...
Nice Regex, much simpler then a lot of [0-9a-z] etc
– George
Jul 6 '16 at 1:16
I found in m...
强烈推荐一款非常mini的代码高亮开源软件--prism - 开源 & Github - 清泛网...
强烈推荐一款非常mini的代码高亮开源软件--prism从网络上搜索开源的代码高亮软件，不下20款，但是我们怎么从中选择一款最适合自己的呢？往往我们比较看重的是其美观度、源码精简度、源码修改难度、代码复制纯度等等。目...
阿里巴巴：大数据基础建议及产品应用 - 资讯 - 清泛网 - 专注C/C++及内核技术
...和存储管控等
角色：云梯研发、运维等
“大数据”的挑战，一个闭环的挑战
数据采集：数据量大且结构多样；离线采集和在线采集技术实现
数据计算：数据质量和效率；开发、计算和存储资源；离线计算和在线计算成...
oracle:完整剖析PL/SQL DEVELOPER与SQL PLUS字符集设置 - 数据库(内核) - ...
...文重点剖析PL SQL DEVELOPER与SQL PLUS字符集设置问题，对两者的中文数据写入、读取之间整个流程做描述，抛砖引玉。工作后要保持...提要：本文重点剖析PL/SQL DEVELOPER与SQL PLUS字符集设置问题，对两者的中文数据写入、读取之间整个...