Python uses the C3 linearization algorithm to determine the order in which to resolve class attributes, including methods. This is known as the Method Resolution Order (MRO).
Here's a simple example:
class Foo(object):
foo = 'attr foo of Foo'
class Bar(object):
foo = 'attr foo o...
Descriptors are objects that are (usually) attributes of classes and that have any of __get__, __set__, or __delete__ special methods.
Data Descriptors have any of __set__, or __delete__
These can control the dotted lookup on an instance, and are used to implement functions, staticmethod, classmet...
The UITableViewDelegate is used to control how the table is displayed, and UITableViewDataSource is used to define the UITableView's data. There are two required methods and many optional ones which can be used to customize size, sections, headings, and cells in the UITableView.
UITableViewDataSo...
To change the default stack order positioned elements (position property set to relative, absolute or fixed), use the z-index property.
The higher the z-index, the higher up in the stacking context (on the z-axis) it is placed.
Example
In the example below, a z-index value of 3 puts green on to...
Relative positioning moves the element in relation to where it would have been in normal flow .Offset properties:
top
left
right
bottom
are used to indicate how far to move the element from where it would have been in normal flow.
.relpos{
position:relative;
top:20px;
left:3...
When absolute positioning is used the box of the desired element is taken out of the Normal Flow and it no longer affects the position of the other elements on the page. Offset properties:
top
left
right
bottom
specify the element should appear in relation to its next non-static containing ...
Sometimes it's not a good practice expose an internal collection since it can lead to a malicious code vulnerability due to it's mutable characteristic. In order to provide "read-only" collections java provides its unmodifiable versions.
An unmodifiable collection is often a copy of a mod...
Consider the following tough-to-vectorize for loop, which creates a vector of length len where the first element is specified (first) and each element x_i is equal to cos(x_{i-1} + 1):
repeatedCosPlusOne <- function(first, len) {
x <- numeric(len)
x[1] <- first
for (i in 2:len) {
...
Prerequisites
nodejs
To install the latest stable release of sails with the command-line tool issue following command:
$ sudo npm install sails -g
Depending on your OS you might not need to use sudo.
If you are using the default bash prompt on Linux, you should see the name of the virtual environment at the start of your prompt.
(my-project-env) user@hostname:~$ which python
/home/user/my-project-env/bin/python
In order to specify which version of python the Linux shell should use the first line of Python scripts can be a shebang line, which starts with #!:
#!/usr/bin/python
If you are in a virtual environment, then python myscript.py will use the Python from your virtual environment, but ./myscript.py...
To help to maintain clean code, Rails follows the principle of DRY.
It involves whenever possible, re-using as much code as possible rather than duplicating similar code in multiple places (for example, using partials). This reduces errors, keeps your code clean and enforces the principle of writin...
By default, the various Collection types are not thread-safe.
However, it's fairly easy to make a collection thread-safe.
List<String> threadSafeList = Collections.synchronizedList(new ArrayList<String>());
Set<String> threadSafeSet = Collections.synchronizedSet(new HashSet<S...
The default value for an enum is zero. If an enum does not define an item with a value of zero, its default value will be zero.
public class Program
{
enum EnumExample
{
one = 1,
two = 2
}
public void Main()
{
var e =...
Now that the router is configured and our app knows how to handle the routes, we need to show the actual components that we configured.
To do so, configure your HTML template/file for your top-level (app) component like so:
//app.ts
import {Component} from '@angular/core';
import {Router, ROUT...
Now that the routes are set up, we need some way to actually change routes.
This example will show how to change routes using the template, but it is possible to change routes in TypeScript.
Here is one example (without binding):
<a routerLink="/home">Home</a>
If the user...
The @import CSS at-rule is used to import style rules from other style sheets. These rules must precede all other types of rules, except @charset rules; as it is not a nested statement, @import cannot be used inside conditional group at-rules.
@import.
How to use @import
You can use @import rule ...
To generate a controller (for example Posts), navigate to your project directory from a command line or terminal, and run:
$ rails generate controller Posts
You can shorten this code by replacing generate with g, for example:
$ rails g controller Posts
If you open up the newly generated app/...
Python uses indentation to define control and loop constructs. This contributes to Python's readability, however, it requires the programmer to pay close attention to the use of whitespace. Thus, editor miscalibration could result in code that behaves in unexpected ways.
Python uses the colon symbo...
