If you want to use scramble.js in your website, you can use this code snippet to generate the scrambled email and indices. You can see the demo of scramble.js on https://jeffdonahue.com/.

generate_scrambled_email_indices.py

# Reference "scramble.js": https://jeffdonahue.com/scramble.js [added]
# https://jeffdonahue.com/

# Author: Abhishek Singh Sambyal
# Usage: Modify the email variable with your email.
# Run: python generate_scrambled_email_indices.py
# Output: scrambled email string with indices

from random import random

email = 'demo_email@institute.edu'
email_list = list(email)
email_dict = {k:v for k, v in enumerate(email_list)}
shuffled_email_dict = dict(sorted(email_dict.items(), key=lambda x: random()))

scrambled_email = ''.join(shuffled_email_dict.values())
scrambled_email_indices = list(shuffled_email_dict.keys())

print(scrambled_email)
print(scrambled_email_indices)

scramble.js

// scramble.js
//
// 2011, Jeff Donahue (http://jeffdonahue.com/).
// license: you can use this if you want to i guess

function scrambledString(tag, objName, initScrambledString, initScrambledStringIndices) {
	this.tag = tag;
	this.objName = objName;
	this.string = initScrambledString;
	this.indices = initScrambledStringIndices;
	this.rescramble = rescramble;
	this.initAnimatedBubbleSort = initAnimatedBubbleSort;
	this.bubbleSortStep = bubbleSortStep;
	this.bubbleSortBookmark = 0;

	this.rescramble();
	this.tag.innerHTML = this.string + ' <a href="#" onClick="' + this.objName + '.initAnimatedBubbleSort();return false;">unscramble</a>';
}

function rescramble() {
	for (i = 0; i < this.indices.length; i++) {
		indexToMove = Math.floor(Math.random() * (this.indices.length - i));
		charIndexRemoved = this.indices.splice(indexToMove, 1);
		this.indices = this.indices.concat(charIndexRemoved);
		scrambledStringTemp = this.string.substring(0, indexToMove) +
			this.string.substring(indexToMove + 1) +
			this.string.substring(indexToMove, indexToMove + 1);
		this.string = scrambledStringTemp;
	}
}

function initAnimatedBubbleSort() {
	this.interval = setInterval(this.objName + '.bubbleSortStep()', 12);
}

function bubbleSortStep() {		
	if (this.bubbleSortBookmark >= this.indices.length - 1) {
		this.bubbleSortBookmark = 0;
	}
	for (i = this.bubbleSortBookmark; i < this.indices.length - 1; i++) {
		if (i == 0) {
			this.changed = 0;
		}
		if (this.indices[i] > this.indices[i + 1]) {
			this.changed = 1;
			tempIndex = this.indices[i];
			this.indices[i] = this.indices[i + 1];
			this.indices[i + 1] = tempIndex;
			tempArrange = this.string.substring(0, i) +
				this.string.substring(i + 1, i + 2) + 
				this.string.substring(i, i + 1) +
				this.string.substring(i + 2);
			this.string = tempArrange;
			this.tag.innerHTML = this.string;
			this.bubbleSortBookmark = i;
			break;
		}
	}
	this.bubbleSortBookmark = i;
	if (!this.changed) {
		clearInterval(this.interval);
	}
}

Added generate_scrambled_email_indices.py with scramble.js.