import twint

# get the followers first
c = twint.Config()
c.Username = "C0r0n4CON"
c.Limit = 10
c.Store_object = True
c.User_full = True

twint.run.Following(c)

# save them in a list
target_followers = twint.output.users_list

# iterate over them and save in a new list
K_followers = []

for user in target_followers:
    if user.followers >= 1000:
        K_followers.append(user)

# now we can save them in an CSV file, for example
with open('K_followers_coronacon.csv', 'w') as output:
    output.write('id,username,followers, following\n')
    for u in K_followers:
        output.write('{},{},{},{}\n'.format(u.id, u.username, u.followers, u.following))