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How to set Python's default version to 3.x on OS X?
...es to add as well, i.e.:
alias 2='python2'
alias 3='python3'
Tip: For scripts, instead of using a shebang like:
#!/usr/bin/env python
use:
#!/usr/bin/env python3
This way, the system will use python3 for running python executables.
...
What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?
...
If the order limit is reached, shouldn't the client alert the user to that and let them change their request appropriately? That seems like a 4xx error. Same goes for the product being sold out. 5xx errors are intended for errors that are caused by the system breaking down in...
Create subdomains on the fly with .htaccess (PHP)
...Host>
3. Work out which subdomain you are on in PHP
Then in your PHP scripts you can find out the domain by looking in the $_SERVER super global variable. Here is an example of grabbing the subdomain in PHP:
preg_match('/([^.]+)\.example\.org/', $_SERVER['SERVER_NAME'], $matches);
if(isset($m...
How to read from a file or STDIN in Bash?
The following Perl script ( my.pl ) can read from either the file on the command line args or from STDIN:
15 Answers
...
Changing the image source using jQuery
...nload each time by each user just for a simple trick - but also native JavaScript(!):
<img src="img1_on.jpg"
onclick="this.src=this.src.match(/_on/)?'img1_off.jpg':'img1_on.jpg';">
<img src="img2_on.jpg"
onclick="this.src=this.src.match(/_on/)?'img2_off.jpg':'img2_on.jpg';">
...
How can I alter a primary key constraint using SQL syntax?
...traint. Instead of editing it through SQL Server, I want to put this in a script to add it as part of our update scripts.
...
Static classes and methods in coffeescript
... Box2DUtility
constructor: () ->
@drawWorld: (world, context) -> alert 'World drawn!'
# And then draw your world...
Box2DUtility.drawWorld()
Demo: http://jsfiddle.net/ambiguous/5yPh7/
And if you want your drawWorld to act like a constructor then you can say new @ like this:
class Box2...
Are PHP functions case sensitive?
...ying output, all will show the same result.
<?php
Echo "This is a test script";
ECHO "This is a test script";
echo "This is a test script";
?>
On the other hand, if you will change the case sensitivity of variables then it will show the error.
Example:
<?php
$a=5;
echo $A;// It will sh...
JavaScript click event listener on class
...unction() {
var attribute = this.getAttribute("data-myattribute");
alert(attribute);
};
for (var i = 0; i < elements.length; i++) {
elements[i].addEventListener('click', myFunction, false);
}
jQuery does the looping part for you, which you need to do in plain JavaScript.
If you ha...
What is the purpose of Flask's context stacks?
...tension object
db.init_app(app)
Then they use the app and db values in a script that should be run from the shell. For example, a "setup_tables.py" script...
from myapp import app, db
# Set up models
db.create_all()
In this case, the Flask-SQLAlchemy extension knows about the app application, ...