Tutorial by Examples: u

To call this code you should create the jar of your scala code. Than you have to call your spark submit like this: spark-submit --master yarn-client --jars ./my-scala-code.jar --driver-class-path ./my-scala-code.jar main.py This will allow you to call any kind of scala code that you need in your...

Sometimes, the straight forward loop cannot be entirely contained within the loop body. This is because, the loop needs to be primed by some statements B. Then, the iteration begins with some statements A, which are then followed by B again before looping. do_B(); while (condition) { do_A(); ...

Using many ECHO commands to create a batch file: ( echo echo hi, this is the date today echo date /T echo echo created on %DATE% echo pause >nul )>hi.bat The command interpreter treats the whole section in parenthesis as a single command, then saves all the output to hi.bat. ...

Ant provides some built-in properties Property NameValuebasedirthe absolute path of the project's basedirant.filethe absolute path of the buildfile.ant.versionthe version of Antant.project.default-targetthe name of the currently executing project's default targetant.project.namename of the projecta...

There are two kind of types in Python. Immutable types and mutable types. Immutables An object of an immutable type cannot be changed. Any attempt to modify the object will result in a copy being created. This category includes: integers, floats, complex, strings, bytes, tuples, ranges and frozen...

One of the major use case when a developer needs to take mutability into account is when passing arguments to a function. This is very important, because this will determine the ability for the function to modify objects that doesn't belong to its scope, or in other words if the function has side ef...

There are four ways to work with JavaScript plugins, Ember add-on Import JavaScript plugins globally Consume named AMD plugins Via ember-browserify

First, complete the installation and setup to connect your app to Firebase. Then from anywhere in your class, you can write: // Write a message to the database FirebaseDatabase database = FirebaseDatabase.getInstance(); DatabaseReference myRef = database.getReference("message"); myRe...

Gradle (All Versions) This method works for all versions of gradle Add the buildscript code at the beginning of your build.gradle file. buildscript { repositories { maven { url "https://plugins.gradle.org/m2/" } } dependencies { classpath "org.example...

Gradle (All Versions) When adding multiple third party plugins you do not need to separate them into different instances of the buildscript(All) or plugin(2.1+) code, new plug ins can be added alongside pre-existing plugins. buildscript { repositories { maven { url "https://plu...

A deque is a double-ended queue. class Deque: def __init__(self): self.items = [] def isEmpty(self): return self.items == [] def addFront(self, item): self.items.append(item) def addRear(self, item): self.items.insert(0,item) def removeFront(self): return self....

When using d3.request() or one of the convenience constructors (d3.json, d3.csv, d3.tsv, d3.html and d3.xml) there are many sources for error. There may be problems with the issued request or its response due to network errors, or the parsing might fail if the content is not well-formed. Within the...

Sample Data: CREATE TABLE table_name ( id, list ) AS SELECT 1, 'a,b,c,d' FROM DUAL UNION ALL -- Multiple items in the list SELECT 2, 'e' FROM DUAL UNION ALL -- Single item in the list SELECT 3, NULL FROM DUAL UNION ALL -- NULL list SELECT 4, 'f,,g' FROM DUAL; -- NULL item...

In config.ini: [DEFAULT] debug = True name = Test password = password [FILES] path = /path/to/file In Python: from ConfigParser import ConfigParser config = ConfigParser() #Load configuration file config.read("config.ini") # Access the key "debug" in "DEF...

Decryption Code public static string Decrypt(string cipherText) { if (cipherText == null) return null; byte[] cipherBytes = Convert.FromBase64String(cipherText); using (Aes encryptor = Aes.Create()) { Rfc2898DeriveBytes pdb = ...

We can use command uname with various options to get complete details of running kernel. uname -a Linux df1-ws-5084 4.4.0-64-generic #85-Ubuntu SMP Mon Feb 20 11:50:30 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux As per man page here few more options Usage: uname [OPTION]... Print certain system inf...

In Twig template, Request object is available at {{ app.request }} When you want display request method in Twig, try this: <p>Request method: {{ app.request.method }}</p> In PHP template <p>Request method: <?php echo $app->getRequest()->getMethod() ?></p>...

While designing a form, you might like to group a few input fields into a group to help organise the form layout. This can be done by using the tag . Here is an example for using it. For each fieldset, you can set a legend for the set using the tag LEGEND TEXT Example <form> <fieldset...

This is a jumbotron with a title, a content and a button. Code <div class="jumbotron"> <h1>Title text</h1> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec tortor ipsum, convallis sit.</p> <p><a class="btn btn-default&...

IObserver<T> and IObservable<T> interfaces can be used to implement observer pattern in .NET IObservable<T> interface represents the class that sends notifications IObserver<T> interface represents the class that receives them public class Stock { private string Sym...