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How SignalR works internally?
...ut how the long polling transport works in particular:
It sends an ajax request to the server that's waiting asynchronously for a signal to respond. When there is a signal or the request times out, it returns from the server and sends another request and the process continues. (I left some details ...
Convert RGBA PNG to RGB with PIL
...
This code was causing a error for me: tuple index out of range. I fixed this by following another question(stackoverflow.com/questions/1962795/…). I had to convert the PNG to RGBA first and then slice it: alpha = img.split()[-1] then use that on the background mask.
...
How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly
...s..]
You can use isnull and any to build a boolean Series and use that to index into your frame:
>>> df = pd.DataFrame([range(3), [0, np.NaN, 0], [0, 0, np.NaN], range(3), range(3)])
>>> df.isnull()
0 1 2
0 False False False
1 False True False
2 False Fa...
How do you run a crontab in Cygwin on Windows?
...tic and contradictory can't switch user context even though the explicit request was made NOT to use other accounts. Account switching with cron on cygwin is apparently MANDATORY. You must say NO to running as yourself...
– user3338098
Apr 27 '15 at 21:43
...
I do not want to inherit the child opacity from the parent in CSS
... opacity:0.2;
background-color:#000;
z-index:3;
position:absolute;
top:0;
left:0;
}
.text{
color:#fff;
}
Output:--
the Text is not visible because inheri...
MySQL: Insert record if not exists in table
...
I'm not actually suggesting that you do this, as the UNIQUE index as suggested by Piskvor and others is a far better way to do it, but you can actually do what you were attempting:
CREATE TABLE `table_listnames` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(255) NOT NULL...
WAMP error: Forbidden You don't have permission to access /phpmyadmin/ on this server
...al machine.
<Directory "c:/wamp/apps/phpmyadmin3.4.5/">
Options Indexes FollowSymLinks MultiViews
AllowOverride all
Order Deny,Allow
Allow from all
</Directory>
Here my WAMP installation is in the c:\wamp folder. Change it according to your installation.
Previ...
Does Python have an ordered set?
...u one better than an OrderedSet: boltons has a pure-Python, 2/3-compatible IndexedSet type that is not only an ordered set, but also supports indexing (as with lists).
Simply pip install boltons (or copy setutils.py into your codebase), import the IndexedSet and:
>>> from boltons.setuti...
Apache is downloading php files instead of displaying them
...is worked for me, just removed that line from my public/.htaccess file and index was loaded.
– PA-GW
Oct 30 '19 at 19:37
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show 1 more comme...
How to architect an Ember.js application
...t type='text/javascript'>
App.Router.map(function() {
this.route("index", { path: "/" });
this.route("list", { path: "/list" });
});
App.IndexController = Ember.Controller.extend({
message: 'Hello! See how index.hbs is evaluated in the context of IndexController'
});
App....