Forgotten Code

[K0NTR0L]

I wrote this code about a year ago and barely understood it then, could someone please break down for me what my code is doing as I am highly confused. Very new to the Python programming language and am trying to get better.

I wrote this in Spyder if that helps.
Edit: This is a program to prove the fact that a descending sort is faster than an unordered sort in the well known bin packing problem.

from random import triangular
import matplotlib.pyplot as plt
import numpy as np
           
def packing(books,boxSize = 1.0):
    totalBooks=len(books)
    boxes=np.zeros(totalBooks)
    for book in books:
        for i,box in enumerate(boxes):
            if book + box <= boxSize:
                boxes[i] += book
                break
            
    return boxes[boxes>0.0]

def bookCreation(totalBooks, sorting):
    bookSet=[triangular(0, 1, 0.4) for i in range(totalBooks)]
    bookSet.sort(reverse=sorting)
    return bookSet
    
def increaseBookTotal(totalBooks, increment = 5):
    sorting = [False, True]
    descending = []
    unordered = []
    nbooks=[]
    localBooks = totalBooks
    
    for sort in sorting:
        totalBooks = localBooks
        for i in range(100):
            boxesAverage = 0.0
            if sort: nbooks.append(totalBooks)
            for j in range(100):

                boxes = packing(bookCreation(totalBooks, sort)).shape[0]
                boxesAverage+=(boxes-boxesAverage)/(1.0+j)
            if sort:
                descending.append(boxesAverage)
            else:

                unordered.append(boxesAverage)
                
            totalBooks += increment
            
    return [nbooks,descending, unordered]

def percentage(totalBooks):
    
    
    nbooks,descending,unordered = increaseBookTotal(totalBooks)
    ratios=np.array(descending)/np.array(unordered)

    return nbooks,ratios
    

totalBooks = 20

nbooks,ratios=percentage(totalBooks)
plt.plot(nbooks,ratios)
plt.ylabel('Improvement.')
plt.xlabel('Number of Books.')
plt.savefig('graph.png')
plt.show()