Reading & Writing to Tape using Python
Albert Hofkamp
hat at se-46.wpa.wtb.tue.nl
Tue Oct 8 07:29:31 EDT 2002
On Thu, 3 Oct 2002 18:59:34 +0100, Ricardo <nospam at here> wrote:
> I have been trying to write data directly to a tape drive using Python (on
> HP-UX and Linux). However, unless the original data is small, I don't get
> it all when I attempt to read it. I suspect this may be due to block size.
Quite likely, although I have never tried that with tapes.
With sockets, I experienced similar problems due to network-packet sizes.
I solved it by repeatedly reading/writing, until I get EOF (an empty
string) cq I run out of bytes to write.
I would expect that to work on a tape device as well.
> Can anybody point me to some example code for doing this?
Since you're asking :-)
def read_tape(fp):
s=''
while 1:
t=fp.read()
if t=='':
break
s=s+t
return s
def write_tape(fp,d):
while d!='':
q=fp.write(d)
assert q>0 # paranoia check
d=d[q:]
--
Albert
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