Tutorial by Examples: u

from bs4 import BeautifulSoup import requests # Use the requests module to obtain a page res = requests.get('https://www.codechef.com/problems/easy') # Create a BeautifulSoup object page = BeautifulSoup(res.text, 'lxml') # the text field contains the source of the page # Now use a CSS ...

A defer statement consists of a block of code, which will be executed when a function returns and should be used for cleanup. As Swift's guard statements encourage a style of early return, many possible paths for a return may exist. A defer statement provides cleanup code, which then does not need ...

When using a defer-statement, make sure the code remains readable and the execution order remains clear. For example, the following use of the defer-statement makes the execution order and the function of the code hard to comprehend. postfix func ++ (inout value: Int) -> Int { defer { value...

functions.php: function rm_init_js() { wp_enqueue_script( 'custom-ajax-script', get_template_directory_uri() . '/js/ajax.js', array( 'jquery', 'wp-util' ), '1.0', true ); // pass custom variables to JS wp_localize_script( 'custom-ajax-script', 'BEJS', array( 'action' => ...

If, during the conversion of: an integer type to a floating point type, a floating point type to an integer type, or a floating point type to a shorter floating point type, the source value is outside the range of values that can be represented in the destination type, the result is undefine...

FFmpeg can be installed on a mixture of Operating Systems, including Unix and OS X. Using a command line extension, this utility can also be installed on Windows using a dll. OS X To install this utility on OS X, just head over to ffmpeg.org, download the release relative to your Macs architec...

When starting Zsh, it'll source the following files in this order by default: /etc/zsh/zshenv Used for setting system-wide environment variables; it should not contain commands that produce output or assume the shell is attached to a tty. This file will always be sourced, this cannot be overrid...

function onButtonClick() { navigator.bluetooth.requestDevice({filters: [{services: ['battery_service']}]}) .then(device => { // Connecting to GATT Server... return device.gatt.connect(); }) .then(server => { // Getting Battery Service... return server.getPri...

function onButtonClick() { navigator.bluetooth.requestDevice({filters: [{services: ['heart_rate']}]}) .then(device => { // Connecting to GATT Server... return device.gatt.connect(); }) .then(server => { // Getting Heart Rate Service... return server.getP...

A Threadpool has a Queue of tasks, of which each will be executed on one these Threads. The following example shows how to add two int arrays using a Threadpool. Java SE 8 int[] firstArray = { 2, 4, 6, 8 }; int[] secondArray = { 1, 3, 5, 7 }; int[] result = { 0, 0, 0, 0 }; ExecutorService po...

If a scoped enum is converted to an integral type that is too small to hold its value, the resulting value is unspecified. Example: enum class E { X = 1, Y = 1000, }; // assume 1000 does not fit into a char char c1 = static_cast<char>(E::X); // c1 is 1 char c2 = static_cast<c...

While you can use the NSUserDefaults methods anywhere, it can sometimes be better to define a manager that saves and reads from NSUserDefaults for you and then use that manager for reading or writing your data. Suppose that we want to save a user’s score into NSUserDefaults. We can create a class ...

Setting overflow value to hidden,auto or scroll to an element, will clear all the floats within that element. Note: using overflow:scroll will always show the scrollbox

Multidimensional Arrays As the name indicates, multi dimensional arrays are arrays that contain more than one dimension, usually two or three but it can have up to 32 dimensions. A multi array works like a matrix with various levels, take in example a comparison between one, two, and three Dimensi...

When committing changes it is possible to specify that the commit will in future be squashed to another commit and this can be done like so, git commit --squash=[commit hash of commit to which this commit will be squashed to] One might also use, --fixup=[commit hash] alternatively to fixup. It is...

A locator in Protractor is used to perform action on HTML dom elements. The most common and best locators used in Protractor are css, id, model and binding. For example commonly used locators are: by.css('css-selector') by.id('id')

Sitecore Instance Manager is open-source tool which is used for managing the local park of Sitecore instances. You can install, locate, maintain, reinstal or delete Sitecore products. It also helps you install your sitecore instance with any sitecore packages, modules and only thing you need to do i...

You can use Modules to build more complex classes through composition. The include ModuleName directive incorporates a module's methods into a class. module Foo def foo_method puts 'foo_method called!' end end module Bar def bar_method puts 'bar_method called!' end end ...

Vectors can be used as a 2D matrix by defining them as a vector of vectors. A matrix with 3 rows and 4 columns with each cell initialised as 0 can be defined as: std::vector<std::vector<int> > matrix(3, std::vector<int>(4)); C++11 The syntax for initializing them using initia...

When creating a UIView subclass, intrinsic content size helps to avoid setting hardcoded height and width constraints a basic glimpse into how a class can utilize this class ImageView: UIView { var image: UIImage { didSet { invalidateIntrinsicContentSize() } ...