Good catch Bill, I was using assoc and ftype to allow me to run my filter.py directly as a command and using:
filter < file Unfortunately, Windows doesn't handle this properly and I had to do C:\Python24\python filter.py < file To get it to work. Thanks, Jeff P.S. In retrospect, I've had the same problem with Perl but because of my newbie status I assumed I was doin' something wrong :-) -----Original Message----- From: Bill Mill [mailto:[EMAIL PROTECTED] Sent: Friday, February 11, 2005 9:38 AM To: Smith, Jeff Cc: [email protected] Subject: Re: [Tutor] Simple question on creating a filter On Fri, 11 Feb 2005 09:28:35 -0500, Smith, Jeff <[EMAIL PROTECTED]> wrote: > I'm sorry to both with such a simple question but I've looked in the > normal places and don't see the quick and dirty answer I know must > exist. > No worries; that's what this list is for. > I want to write a simple line selection filter that could be used > like: > > filter < file > > In Perl I would do: > > while (<>) > { > print if line meets selection criteria; > } > > I've tried what I thought would be the Python equivalent but it > doesn't > work: > > for line in sys.stdin: > if line meets selection criteria: > print line > > I get the following at runtime: > > Traceback (most recent call last): > File "U:\TimeKeeper\mine.py", line 2, in ? > for line in sys.stdin: > IOError: [Errno 9] Bad file descriptor > I'm not quite sure how you're getting that "bad file dscriptor" error. My code, also on windows (and cygwin) with python2.4: /d/code/python$ cat test.py import sys for line in sys.stdin: if line.startswith('a'): print line.strip() /d/code/python$ cat test_in aline1 bline2 aline3 cline4 /d/code/python$ python test.py < test_in aline1 aline3 Try to run it like I did, and let me know if it gives you the same thing; that'll give us a common point of reference. Peace Bll Mill bill.mill at gmail.com > This is with Python 2.4 on Windows. > > Jeff > _______________________________________________ > Tutor maillist - [email protected] > http://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - [email protected] http://mail.python.org/mailman/listinfo/tutor
