import json

liste=[]
with open ('yelp.txt') as file:
    for line in file:
        liste.append(json.loads((line)))


for e in range (len(liste)
    if 'is_open' not in liste
        liste.remove(liste[e])
    if int(liste['is_open'])==0
        liste.remove(liste[e])
print(len(liste))