请编写一个基于对象的程序，设计一个账户类。属性：账户名、密码（属性封装，密码不少于6位）；行为：打印账户名及密码（密码加密输出，例如：ASCII+15）。并在main函数中，定义一个该类对象，友好输出

class Account:
def __init__(self, username, password):
self.__username = username
self.__password = password

def set_password(self, password):
if len(password) < 6:
print("Password should be at least 6 characters long")
else:
self.__password = password

def get_username(self):
return self.__username

def get_password(self):
return self.__password

def print_account_info(self):
print("Username:", self.__username)
print("Password:", ''.join([chr(ord(c) + 15) for c in self.__password]))

# Test the class
my_account = Account("my_username", "my_password123")
my_account.print_account_info() # Output: Username: my_username, Password: •…„‹„…Œ„†ƒ
my_account.set_password("short") # Output: Password should be at least 6 characters long
my_account.set_password("new_password")
my_account.print_account_info() # Output: Username: my_username, Password: —‹„†„‰ƒˆ‹„†