physical hardware accesss

[Robert Cragie]

Grant Edwards <ge at nowhere.none> wrote in message
news:gYT%4.1084$zm3.245488 at ptah.visi.com...
| In article <393f4dd2$0$2877 at wodc7nh6.news.uu.net>, Blu Dragoon wrote:
| >If I wanted to would be able to probe a serial, parallel, or USB port
| >with python.
|
| >Open(/dev/cua1)
| >Write(/dev/cua1)
|
| How about:
|
|  fd = os.open("/dev/cua1")
|  os.write(fd,buffer)

You missed out the flags in os.open():

fd = os.open("/dev/cua1", O_RDWR)

os.open() is the low-level 'open'. You could also use the 'higher-level
(possibly 'preferred'?)' built-in open(), which returns a file object:

file = open("/dev/cua1", "rw")
file.write(buffer)

If you need to do ioctl() etc. you can get the low-level file number using
the fileno() method, e.g.

fd = file.fileno()

Robert Cragie