David wrote:
line = infile.readline() # Invokes readline() method on file
while line:
outfile.write(line), # trailing ',' omits newline character
line = infile.readline()
The 'while' loop can be replaced by a 'for' loop, like
for line in infile:
outfile.write(line)
infile.close()
outfile.close()
</code>
As I said, before writing to file "pyout" I would like to append the
string " -d" to each line. But how, where? I can't append to strings
(which the lines gained with infile.readline() seem be), and my trial
and error approach has brought me nothing but a headache.
readline() literally reads a line, including the terminating \n at the end.
(the end-of-file indication uses the empty string. By returning the
terminating \n as well, an empty line becomes a "\n" string, so you can
distinguish between both cases).
The simplest solution would be to construct a new line from the old one
directly below the 'while', for example
line2 = line[:-1] + " -d\n"
followed by writing line2 to disk.
The question that arises however is, what should be done with a line like
"bla bla \n"
Do you want
"bla bla -d\n"
or do you want
"bla bla -d\n"
here?
If the latter, you may want to use str.rstrip() that deletes all white-space
from the end of the line, like
line2 = line.rstrip() + " -d\n"
Sincerely,
Albert
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
