gistfile1.txt

users = {}
for i in range(len(df)):
    user_id = df.iloc[i].user_id
    if user_id not in users:
        users[user_id] = 1
    else:
        users[user_id] += 1
        
        
num_recipes_range = (100,500)

users_of_interest = []
for user, num_recipes in users.items():
    if num_recipes >= 100 and num_recipes <= 500:
        users_of_interest.append(user)