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What is the purpose of double curly braces in React's JSX syntax?
... an object literal inlined in the prop value. It's the same as
var obj = {__html: rawMarkup};
<span dangerouslySetInnerHTML={obj} />
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pandas GroupBy columns with NaN (missing) values
...n the Missing Data section of the docs:
NA groups in GroupBy are automatically excluded. This behavior is consistent with R, for example.
One workaround is to use a placeholder before doing the groupby (e.g. -1):
In [11]: df.fillna(-1)
Out[11]:
a b
0 1 4
1 2 -1
2 3 6
In [12]: df.fil...
Unable to generate an explicit migration in entity framework
...the database OR you can delete the pending migration file ([201203170856167_left]) from your Migrations folder and then re-run "add-migration" to create a brand new migration based off of your edits.
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How to migrate back from initial migration in Django 1.7?
...lt;app> zero
This clears <app> from migration history and drops all tables of <app>
See django docs for more info.
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Code coverage with Mocha
...ul is. Try the following, after you get your mocha tests to pass:
npm install nyc
Now, simply place the command nyc in front of your existing test command, for example:
{
"scripts": {
"test": "nyc mocha"
}
}
sha...
Cropping an UIImage
...of the center of the image - I use this to take a UIImage and return a small, square representation of an image, similar to what's seen in the album view of the Photos app. (I know I could use a UIImageView and adjust the crop mode to achieve the same results, but these images are sometimes disp...
How to create a self-signed certificate with OpenSSL
...
For anyone else using this in automation, here's all of the common parameters for the subject: -subj "/C=US/ST=Oregon/L=Portland/O=Company Name/OU=Org/CN=www.example.com"
– Alex S
Jun 5 '15 at 18:13
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Should I use the datetime or timestamp data type in MySQL?
...
Timestamps in MySQL are generally used to track changes to records, and are often updated every time the record is changed. If you want to store a specific value you should use a datetime field.
If you meant that you want to decide between using a UNIX ...
How can I selectively merge or pick changes from another branch in Git?
I'm using Git on a new project that has two parallel -- but currently experimental -- development branches:
25 Answers
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MFC Grid control 2.27 - C/C++ - 清泛网移动版 - 专注IT技能提升
...ch and useable as something of this form can be. Dozens of developers from all over the world have contributed fixes, improvements and suggestions over the 4 years that the grid has been growing, and there is still no end in sight. Most of the fixes have been sent in by readers so I'm trusting that ...