Hello,
Yesterday, I was at a programming competition. We programmed on Linux
liveCD's and Python was one of the allowed languages (among C and
Java). I cared just about the algorithmic approach so I used Python.
One of the main rules is, that the code reads its standard input and
dumps the result on the standard output. Here happened my bigger
programming mistake ever - I used the following approach :
====
import sys
print sys.stdout.readlines() # TYPO ! stdin != stdout
====
So the WEIRD issue is, that it worked and, executing the following
code I get :
====
[EMAIL PROTECTED] ~ $ python la.py
test
test #2
['test \n', 'test #2\n']
[EMAIL PROTECTED] ~ $
====
Ok, as the algorithm worked perfectly, and all the test cases we were
given were positive, I've continued with the next problem, copy/
pasting the above idiom... When they tested the code, they used file
redirection like :
==
python la.py < /somefile
==
And, my code resulted in no output/input (=> 0 points), which can be
proved here too :
====
[EMAIL PROTECTED] ~ $ python la.py < /etc/passwd
===
Some friend of mine told me that's the Unix way, (stdout can act like
stdin) so I tried some C code :
===
1 #include <stdio.h>
2
3 int main() {
4 char buf[120];
5 while (fgets(buf, sizeof(buf), stdout) != NULL) {
6 puts(buf);
7 }
8 return 0;
9}
===
The code returns with no delay, so I'm really wondering where is that
nice sys.{stdin,stdout} feature inplemented as pydoc doesn't mention
anything. I'd spot the mistake before submitting the problem solutions
if it was written in C :)
Thanks!
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