prog1 | prog2 . How not to make prog2 block if not piped?

[Steve Holden]

imcs ee wrote:
> yeah, forget my post ,it;s useless.
> sorry for my thoughtless
> On 14 Jun 2006 10:40:15 -0700, riquito at gmail.com <riquito at gmail.com> wrote:
> 
>>imcs ee ha scritto:
>>
>>
>>>do u really need read something even when you run the scripts2.py directly?
>>>why not just change script2.py to
>>> #script2.py
>>>if __name__ == "__main__":
>>>    x=sys.stdin.read()
>>>    print 'passed'
>>>else:
>>>    print 'passed from else branch'
>>>
>>>is it what  you want? or anything i misunderstand.
>>
>>it won't do. clever btw.
>>Script2 is not a module, it's a program that _could_ receive input via
>>pipe.
>>
It really doesn't matter *how* it receives input, whether from a pipe, 
or a terminal or a redirected file.

When you run it "standalone" you should give it some input - type some 
text then enter ^D (on Unix-like systems) or ^Z (on Windows). How else 
do you expect read() to return anything? It *has* to read to the end fo 
the file before it returns a value.

regards
  Steve
-- 
Steve Holden       +44 150 684 7255  +1 800 494 3119
Holden Web LLC/Ltd          http://www.holdenweb.com
Love me, love my blog  http://holdenweb.blogspot.com
Recent Ramblings     http://del.icio.us/steve.holden