Tutorial by Examples: l

An anonymous, inlined function defined with lambda. The parameters of the lambda are defined to the left of the colon. The function body is defined to the right of the colon. The result of running the function body is (implicitly) returned. s=lambda x:x*x s(2) =>4

Filter takes a function and a collection. It returns a collection of every item for which the function returned True. arr=[1,2,3,4,5,6] [i for i in filter(lambda x:x>4,arr)] # outputs[5,6]

webpack.config.js const webpack = require("webpack") const helpers = require('./helpers') const path = require("path") const WebpackNotifierPlugin = require('webpack-notifier'); module.exports = { // set entry point for your app module "entry": { ...

Detailed instructions on getting identityserver3 set up or installed.

let label = UILabel.init(frame: CGRect(x: 0, y:0, width: 100, height: 40)) label.backgroundColor = .lightGray let attributedString = NSMutableAttributedString.init(string: "Apply UnderLining") attributedString.addAttribute(NSUnderlineStyleAttributeName, value: 1, range: NSRange.init...

//Header File <CallKit/CXCallObserver.h> CXCallObserver *callObserver = [[CXCallObserver alloc] init]; // If queue is nil, then callbacks will be performed on main queue [callObserver setDelegate:self queue:nil]; // Don't forget to store reference to callObserver, to prevent it ...

Everything in Python is an object. Each object has some special internal methods which it uses to interact with other objects. Generally, these methods follow the __action__ naming convention. Collectively, this is termed as the Python Data Model. You can overload any of these methods. This is comm...

HTMLUnitDriver HTMLUnitDriver is the most lightweight implementation of headless(GUI-less) browser for Webdriver based on HtmlUnit. It models HTML documents and provides an API that allows you to invoke pages, fill out forms, click links, etc. just like you do in your normal browser. It supports J...

A way to create a list is to place elements in two square brackets, separated by semicolons. The elements must have the same type. Example: > let integers = [1; 2; 45; -1];; val integers : int list = [1; 2; 45; -1] > let floats = [10.7; 2.0; 45.3; -1.05];; val floats : float list = [1...

Changing the order (or position) was possible in Bootstrap 3 using the push pull classes. In Bootstrap 4, the push pull classes still work, and additionally flexbox order can be used. In Bootstrap 4, the push pull classes are now push-{viewport}-{units} and pull-{viewport}-{units} and the xs- infix...

Given that the data directory of the server is empty: The server is initialized. SSL certificate and key files are generated in the data directory. The validate_password plugin is installed and enabled. The superuser account 'root'@'localhost' is created. The password for the superuser is set ...

To reveal the default "root" password: shell> sudo grep 'temporary password' /var/log/mysqld.log Change the root password as soon as possible by logging in with the generated temporary password and set a custom password for the superuser account: shell> mysql -uroot -p mysql...

Processing Field collection items with Rules is fun, really! Have a look at this Rule (in Rules export format): { "rules_calculate_sum_of_prices_in_all_field_collection_items" : { "LABEL" : "Calculate sum of prices in all field collection items", "PLUGIN...

It is a good practice to add comments that describe the code. It is helpful for others and even for the coder when returned later. A single line can be commented using the % symbol or using the shortkey Ctrl+R. To uncomment a previously commented line remove the % symbol or use shortkey Crtl+T. W...

While handling not in sub-query with null in the sub-query we need to eliminate NULLS to get your expected results create table #outertable (i int) create table #innertable (i int) insert into #outertable (i) values (1), (2),(3),(4), (5) insert into #innertable (i) values (2), (3), (null) s...

Keychain allows to save items with special SecAccessControl attribute which will allow to get item from Keychain only after user will be authenticated with Touch ID (or passcode if such fallback is allowed). App is only notified whether the authentication was successful or not, whole UI is managed b...

Detailed instructions on getting omnet++ set up or installed.

It's possible to pass variables from your server into Pug for dynamic content or script generation. Pug templates can access variables passed to the res.render function in Express (or pug.renderFile if you are not using Express, the arguments are identical). index.js let colors = ["Red",...

Content interpolated with bracket syntax will be evaluated for code, the output of which is included in your HTML output. title follows the basic pattern for evaluating a template local, but the code in between #{and } is evaluated, escaped, and the result buffered into the output of the template...

Interpolating values is helpful if you need to pass a server-side variable to client-side JavaScript (or other languages that require it). In the case of variables, numbers, strings, and the like, you can pass these types of variables directly into your JavaScript with bracket syntax plus an explan...