import ctypes

class UserInfo(ctypes.Structure):

_fields_ = [('info', ctypes.c_char_p)]

def __del__(self):

del_user_info(self)

lib = ctypes.CDLL('./del.so')

get_user_info = lib.getUserInfo

get_user_info.argtypes = [ctypes.c_char_p]

get_user_info.restype = UserInfo

del_user_info = lib.delUserInfo

del_user_info.argtypes = [UserInfo]

def work_work():

user1 = get_user_info('Alice'.encode())

print('Info:', user1.info.decode())

print('-----------')

user2 = get_user_info('Bob'.encode())

print('Info:', user2.info.decode())

print('-----------')

# Now user1 and user2 should get deleted.

work_work()

print('Did I remember to free my memory?')