# -*- coding: utf-8 -*-
# Python
# to open a file and write to file
# do
f=open('xfile.txt','w')
# this creates a file "object" and name it f.
# the second argument of open can be
# 'w' for write (overwrite exsiting file)
# 'a' for append (ditto)
# 'r' or read only
# to actually print to file or read from
# file, one uses methods of file
# objects. e.g.
# reading entire file
# text = f.read()
# reading the one line
# line = f.realine()
# reading entire file as a list, of lines
# mylist = f.readlines()
# to write to file, do
f.write('yay, first line!\n')
# when you are done, close the file
f.close()
# closing files saves memory and is
# proper in large programs.
# see
# http://python.org/doc/2.3.4/tut/node9.html
# or in Python terminal,
# type help() then topic FILES
# try to write a program that read in a
# file and print it to a new file.
------------------------
# in perl, similar functionality exists.
# their construct is quite varied.
# example of reading in file
# and print it out
# (first, save this file as x.pl)
open(f,"<x.pl") or die "error: $!";
while ($line = <f>) {print $line}
close(f) or die "error: $!";
print "am printing myself\n";
# the above is a so called "idiom"
# meaning that it is the way such is
# done in a particular language, as in
# English.
# note, the f really should be F in Perl
# by some references, but can also be
# lower case f or even "f". All are not
# uncommon. There is no clear reason for
# why or what should be or what
# is the difference. Usually it's
# not worthwhile to question in
# Perl. ">x.pl" would be for write to
# file. The <f> tells perl the file
# object, and when Perl sees t=<> it
# reads a line. (usually, but technically
# depending on some predefined
# variables...) The f they call "file handle".
# ... see
# perldoc -tf open
# to begin understanding.
------------
Note: this post is from the Perl-Python a-day mailing list at
http://groups.yahoo.com/group/perl-python/
to subscribe, send an email to [EMAIL PROTECTED]
if you are reading it on a web page, program examples may not run
because html conversion often breaks the code.
Xah
[EMAIL PROTECTED]
http://xahlee.org/PageTwo_dir/more.html
--
http://mail.python.org/mailman/listinfo/python-list
