soluzione trovata:

    file = open(fileName, 'wb')
    for entry in bytes:
        file.write(struct.pack('b', entry))
    file.close()

e verifica del file prodotto:

jar tvf /products/.../DummyEvent-sbconfig.jar

 23728 Mon Oct 01 15:49:26 CEST 2007 ExportInfo
   264 Mon Oct 01 15:49:26 CEST 2007 
EventBus-DummyEvent/providers/Provider2/_folderdata.LocationData
 11553 Mon Oct 01 15:49:26 CEST 2007 
EventBus-DummyEvent/providers/Provider2/DummyEvent-Provider2-SingleXMLFileProvid.ProxyService
   686 Mon Oct 01 15:49:26 CEST 2007 
EventBus-DummyEvent/consumers/Consumer1/resource/DummyEvent-Consumer1-ConsumerEventTransf.Xquery
...

ciao
ferp

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Francesco 
Guerrieri
Sent: lunedì, 1. ottobre 2007 15:31
To: Discussioni generali sul linguaggio Python
Subject: Re: [Python] Come scrivere un array di bytes in un file binario


On 10/1/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> provato ma:
>
> cat my.jar
> array([80, 75, 3, 4, 20, 0, 8, 0, 8, 0, -111, 121, 65, 55, 0, 0, 0, 0, 0, 0, 
> 0, 0, 0, 0, 0, 0, 10, 0, ...., 0, 0, 0], byte)


Questo vuol dire che str(bytes) ha quella rappresentazione. Cosa ti
aspettavi invece?

Potresti provare a usare

output_file.write(repr(bytes))


ciao
francesco
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