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Return None if Dictionary key is not available
I need a way to get a dictionary value if its key exists, or simply return None , if it does not.
11 Answers
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Jackson Vs. Gson [closed]
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Gson 1.6 now includes a low-level streaming API and a new parser which is actually faster than Jackson.
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Using Enum values as String literals
...you have FOUR options here. All four offer a solution but with a slightly different approach...
Option One: use the built-in name() on an enum. This is perfectly fine if you don't need any special naming format.
String name = Modes.mode1.name(); // Returns the name of this enum constant, exact...
CSS hack大全 - 创意 - 清泛网 - 专注C/C++及内核技术
...色是金黄色，Safari和Chrome使用的都是Webkit内核</span >
<!--[if IE 8]>IE8的辨别色是蓝色，新版IE8的功能可是不少呢。<![endif]-->
<!--[if IE 7]>IE7的辨别色是紫色，IE7还可以凑合着用！<![endif]-->
<!--[if IE 6]>IE6的辨别色是红色，不过，IE6可...
Adding external library into Qt Creator project
...rary name (without the extension and without any 'lib' prefix). Of course, if you are including a Windows specific lib, this really doesn't matter.
In case you want to store your lib files in the project directory, you can reference them with the $$_PRO_FILE_PWD_ variable, e.g.:
LIBS += -L"$$_PRO_...
OpenSSH升级后不能登录的问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...d for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
# If you want to change the port on a SELinux system, you have to tell
# SELinux about ...
How do I make an asynchronous GET request in PHP?
...This is a handy code snippet, and I've been using it here and there, but I now find that I need to do the same thing, but with an SSL site. Is there anything I need to change besides the HTTP/1.1 type and the port?
– Kevin Jhangiani
Apr 12 '11 at 21:59
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Redirecting EC2 Elastic Load Balancer from HTTP to HTTPS
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AWS Application Load Balancers now support native HTTP to HTTPS redirect.
To enable this in the console, do the the following:
Go to your Load Balancer in EC2 and tab "Listeners"
Select "View/edit rules" on your HTTP listener
Delete all rules except for...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...PHP等语言不一样，sh的流程控制不可为空，如：
<?php
if (isset($_GET["q"])) {
search(q);
}
else {
//do nothing
}
在sh/bash里可不能这么写，如果else分支没有语句执行，就不要写这个else。
还要注意，sh里的if [ $foo -eq 0 ]，这个方括...
Convert Rows to columns using 'Pivot' in SQL Server
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If you are using SQL Server 2005+, then you can use the PIVOT function to transform the data from rows into columns.
It sounds like you will need to use dynamic sql if the weeks are unknown but it is easier to see the correc...