This might be hack-ish, more elegant solutions are likely to exist, but this
is the general idea:
LINEFEED = "\n" # or whatever
EOR = "?" # or whatever
def fixEOR(filename):
f = open(filename,"r+")
byte = True
# loops through whole file
while True:
# loops through record
while byte and (byte != EOR):
byte=f.read(1)
if not byte:
break
f.seek(-1,1) # backup 1
byte = LINEFEED
f.write(byte) # incidentally, will put LINEFEED at EOF
f.flush()
f.close()
On Wednesday 09 March 2005 02:06 pm, Greg Lindstrom wrote:
> Hello-
>
> I have a task which -- dare I say -- would be easy in <asbestos_undies>
> Perl </asbestos_undies> but would rather do in Python (our primary
> language at Novasys). I have a file with varying length records. All
> but the first record, that is; it's always 107 bytes long. What I would
> like to do is strip out all linefeeds from the file, read the character
> in position 107 (the end of segment delimiter) and then replace all of
> the end of segment characters with linefeeds, making a file where each
> segment is on its own line. Currently, some vendors supply files with
> linefeeds, others don't, and some split the file every 80 bytes. In
> Perl I would operate on the file in place and be on my way. The files
> can be quite large, so I'd rather not be making extra copies unless it's
> absolutely essential/required.
>
> I turn to the collective wisdom/trickery of the list to point me in the
> right direction. How can I perform the above task while keeping my sanity?
>
> Thanks!
> --greg
> --
> Greg Lindstrom 501 975.4859
> Computer Programmer [EMAIL PROTECTED]
> NovaSys Health
> Little Rock, Arkansas
>
> "We are the music makers, and we are the dreamers of dreams." W.W.
--
James Stroud, Ph.D.
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095
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