How to use 'python socket disconnect' in Python

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def on_connect(self, socket):
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    # Called whenever a new connection is accepted.
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    # socket = Source socket.
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    pass

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@sio.on(ROUTES['BACK']['DISCONNECT'])
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async def disconnect(sid):
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    if sid in users_socket:
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        user = users_socket[sid]
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        del users_by_user_id[user["id"]]
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        sids_fir_remove = list()
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        try:
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            for user_data in users_socket:
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                if users_socket[user_data]['id'] == user['id']:
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                    sids_fir_remove.append(user_data)
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            for sid in sids_fir_remove:
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                del users_socket[sid]
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                del sio.environ[sid]
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            if user:
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                await sio.emit(ROUTES['FRONT']['USER']['ONLINE'], {
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                    'data': [users_by_user_id[user] for user in users_by_user_id]
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                }, namespace='/')
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        except:
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            pass
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    return await sio.disconnect(sid)