Ciao Gianluca!
many thanks for your help, following your suggestion
- I downloaded Lightstreamer Allegro/Presto/Vivace Editions at http://download.lightstreamer.com/
- I installed the deploy of stocklist demo at https://github.com/Weswit/Lightstrea...-java/releases (unzip and copying the folder into <LS path>\adapters\Demo\stocklist
- I aligned Java version with the mine : set JAVA_HOME=C:\Program Files\Java\jdk1.8.0_25 of file LS.bat in <LS path>\bin\windows
- I lauched Start_LS_as_Application.bat
- successfully checked that via browser at http://localhost:8789/demos/StockListDemo/ push stock data are displayed (I randomly choose 8789 as port, I aligned the port into conf file : <port>8789</port> of file lightstreamer_conf.xml )
- from the python IDLE, I run the code without any modification except the port at
lightstreamer_client = LSClient("http://localhost:8789", "DEMO")

now I see the following:

Python 2.7.2 (default, Jun 12 2011, 14:24:46) [MSC v.1500 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>>
------------HIT CR TO UNSUBSCRIBE AND DISCONNECT FROM LIGHTSTREAMER-------------

(no new lines after this one, I waited ~10 minutes)

I have
- Windows 7 64bit
- Python 2.7.8
- Java jdk1.8.0_25

I'm available for further tests, any help or hint will be appreciated

Thanks and br