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#source: https://stackoverflow.com/a/1920585/5405197

# With Python 2.6+ you can just do:
echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool

#or, if the JSON is in a file, you can do:
python -m json.tool my_json.json


#if the JSON is from an internet source such as an API, you can use

ademidun

# use this if you want to delete a specific number of entries
# https://stackoverflow.com/questions/13248593/django-database-delete-specific-number-of-entries
HomeImage.objects.filter(pk__in=HomeImage.objects.filter(ImageVectors={}).values_list('pk')[:5000])#.delete()

ademidun

<iframe src="//www.youtube.com/embed/_youtube_id_" width="560" height="315" frameborder="0" 
        allowfullscreen="allowfullscreen">
</iframe>
<iframe class="i-amphtml-fill-content" style="z-index: 0; width: 500px; height: 200px;"
        src="https://open.spotify.com/embed/show/0m74ZmCPgjvp5WGOMg3P9C#amp=1"
        name="amp_iframe0" width="src=" frameborder="0" sandbox="allow-scripts allow-same-origin">
</iframe>

ademidun

-- A collection of sample queries in Postgres


-- Get demographic data for users

SELECT gender, Count(*) as genders from dante_userprofile as userprofile
JOIN applications_application as application
ON application.user_id=userprofile.user_id
WHERE application.is_submitted=True
-- WHERE is_finalist=True

ademidun

# Rename File Extensions
# https://www.maketecheasier.com/rename-files-in-linux/
brew install rename;
rename 's/.m4a/.mp3/' * # rename all .m4a files to .mp3 (don't forget to include the asteriks '*')

# delete all files with a certain extension
# https://askubuntu.com/questions/377438/how-can-i-recursively-delete-all-files-of-a-specific-extension-in-the-current-di
find . -name "*.bak" -type f #first check the files that will be deleted
find . -name "*.bak" -type f -delete # then you can delete them

ademidun

// src/main.ts
import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}

ademidun

from botocore.exceptions import ClientError


def dict_to_dynamo(data):
# if you try to save an empty string to dynamo you will get the following error:

# 'An error occurred (ValidationException) when calling the BatchWriteItem operation: One or more parameter values were invalid: An AttributeValue may not contain an empty string'
# This function recursively converts all empty string to valid None/Null type values that dynamo accepts
# https://gist.github.com/JamieCressey/a3a75a397db092d7a70bbe876a6fb817

ademidun

# Lavar Ball is looking for scholarships to help pay for school.
# He has 2 lists, A and B. 
# A is a cache of Lavar's scholarships as an array of primary keys.
# B is an array of scholarship objects matching Lavar's profile.
# Lavar needs to sort the objects in B based on the PKs of A, to get a new B (B_2).
# Lavar needs it done in less than O(n^2) time so he doesn't get bored and starts browsing Reddit.

# e.g. 
A = [3,139,47] # arbitrary order
B = [{pk:139,name:'Scholarship X'},{pk:47,name:'Scholarship Y'},{pk:3,name:'Scholarship Z'}]

ademidun

public boolean canFinish(int numCourses, int[][] prerequisites) {
	    if(prerequisites == null){
	        throw new IllegalArgumentException("Invalid Prerequisites");
	    }
	 
	    int p_len = prerequisites.length;
	 
	    if(p_len == 0||numCourses == 0){
	        return true;
	    }

ademidun

public class MyStack<T extends Comparable<T>>{

	private static class StackNode<T extends Comparable<T>> {
		private Comparable<T> data;
		private StackNode<T> next;

		public StackNode(Comparable<T> item){
			this.data =item;
		}