Pick two recipes at random from a weighted csv

recipes.py

from random import  choices
import csv
import string

def pick():

    with open("recipes.csv") as f:
        r = csv.reader(f)
        data = list(r)
    recipes, weights = zip(*data)
    weights = [int(x) for x in weights]
    picks = choices(recipes, weights=weights, k=2)
    return picks

def app(environ, start_response):
    """Simplest possible application object"""

    picks = '<br/>'.join(pick())

    with open("template.html") as f:
        template = f.read()

    t = string.Template(template)
    b = t.substitute(data=picks).encode()
    status = '200 OK'
    response_headers = [
        ('Content-type', 'text/html'),
        ('Content-Length', str(len(b)))
    ]
    start_response(status, response_headers)
    return iter([b])