I've a pandas dataframe with some analisis and need to filter and print in html by flask only X latest rows with upper or down arrows.

I am trying to make the code but I am making a tremendous mess between so much data and how to pass it to the html. I have this part but it doesn't work. Any idea to made it posible?

from flask import Flask,render_template

df = pd.read_csv('data.csv')

@app.route('/')
def index():
    lastdates = 5
    product = {
        "brand":"Dyson",
        "model":"mod2019"
    }

    mod2019 = df['mod2019']
    result2019 = mod2019.tail(lastdates).values[0]

    if result2019 == '