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class SensitiveInfo:

def __init__(self):

self.users = ['nick', 'tom', 'ben', 'mike']

def read(self):

nb = len(self.users)

print(f"There are {nb} users: {' '.join(self.users)}")

def add(self, user):

self.users.append(user)

print(f'Added user {user}')

class Info:

'''protection proxy to SensitiveInfo'''

def __init__(self):

self.protected = SensitiveInfo()

self.secret = '0xdeadbeef'

def read(self):

self.protected.read()

def add(self, user):

sec = input('what is the secret? ')

self.protected.add(user) if sec == self.secret else print("That's wrong!")

def main():

info = Info()

while True:

print('1. read list |==| 2. add user |==| 3. quit')

key = input('choose option: ')

if key == '1':

info.read()

elif key == '2':

name = input('choose username: ')

info.add(name)

elif key == '3':

exit()

else:

print(f'unknown option: {key}')

if __name__ == '__main__':

main()