On Fri, 2 Jul 2010 11:16:02 pm David Hutto wrote:
> In the code below, I'm trying to read from a file, and print out the
> lines.
f = open("filename.txt")
for line in f:
print line
f.close()
is all you need, and even the close at the end is optional (but
recommended).
> I know I've seen the exact function I'm looking for here, but
> it seems like the below 'should' work.
>
> The second function(rdfil) works, if just the line number is placed
> there, and th first(increment) works for printing a new number in
> range for the rdfil to operate while going through the lines in the
> file.
> Any other options other than using linecache.getline(I'm sure there
> are, just haven't jogged the right memory cell loose yet)?
>
> def increment():
> for number in range(1, 500):
> print number ++1
Why do you have number ++1 instead of just number+1 ?
For that matter, why do you have number+1 instead of changing the range
to range(2, 501)?
> def rdfil():
> outputfile = raw_input('Input file name: ')
This puts a *string* in the variable outputfile. A better name would
be "outputfilename", because it is a file NAME, not a file.
> for line in outputfile:
This is terribly misleading, because iterating over a string gives you
the individual characters of the string, not lines. E.g.:
for line in "file.txt":
print line
will print:
f
i
l
e
.
t
x
t
> if line:
This will always be true, and so is pointless. Even an empty line is not
truly empty, as it will be a newline character. When the file is empty,
the for-loop will exit.
> readcont = linecache.getline(outputfile, increment)
> '''increment
> is originally supposed to be an int for the line number being read'''
This line gives a syntax error. What is it supposed to be? What is the
purpose of the string? It looks like it is meant to be a comment, but
why have you written it as a string instead of a # comment?
--
Steven D'Aprano
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