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Before Installation
=========================
#To generate graph in png format, 
#Install following dependent packages
sudo apt-get install libpng-dev
sudo apt-get install libfreetype6-dev

#TkAgg for the TkInter windowing system
sudo apt-get install tcl-dev tk-dev python-tk python3-tk

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RED: RGB(169,68,66), #a94442
BLUE: RGB(10,40,72), #0A2848 

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var express = require("express")
var app = express()
app.locals.global_value = 0;
app.get("/",function(req,res){
	app.locals.global_value += 1;
	res.send("<h3>Welcome!</h3>. You have visitied this page: "+app.locals.global_value+" times.");
})
app.get("*",function(req,res){
	res.send("You are nowhere! Please click on this <a href=\"/\">link</a> to go to homepage.");
})

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<?php
	$server = "localhost";
	$db_username = "root";
	$db_password = "";
	$db_name = "learn_project_db";
	$conn = new PDO("mysql:host=$server;dbname=$db_name",$db_username,$db_password);
	$sql_query = "SELECT * FROM wrong_user_table";
	$stmt = $conn->prepare($sql_query);
	$stmt->execute();
	$result_set = $stmt->fetchAll();

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#sudo pip3 install copyusb

import copyusb
a = copyusb.copy()
print(a)

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<?php
require("./amazon-sdk/sdk.class.php");
// on ubuntu - this script can be run using php5-cli and php5-curl

    //Provide the Key and Secret keys from amazon here.
    $AWS_KEY = "kkk";
    $AWS_SECRET_KEY = "kkkk+xKcdkB";
    //certificate_authority true means will read CA of amazon sdk and false means will read CA of OS
    $CA = true;

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python 2.7 + django 1.11 in Ubuntu 16.04 (LTS)
================================================
# Install Python Package Installer (PIP) 
sudo apt-get install python-pip

# Upgrade PIP
sudo -H pip install --upgrade pip

# Install IDLE 
sudo apt-get install idle

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import collections
d={
    "Apple": 5,
    "Banana": 95,
    "Orange": 2,
    "Mango": 7
}
# sorted the dictionary by value using OrderedDict
od = collections.OrderedDict(sorted(d.items(), key=lambda x:x[1]))
print(od)

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_=lambda:list(map(int,input().split()))
x,y=_()

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$('body > :not(#d_content_inner)').hide(); //hide all nodes directly under the body
$('#d_content_inner').appendTo('body');