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

Maric Michaud maric at aristote.info
Wed Jun 14 17:40:36 CEST 2006


Le Mercredi 14 Juin 2006 17:13, riquito at gmail.com a écrit :
> # script1.py #
> print 'something'
>
> #script2.py
> x=sys.stdin.read()
read() will read a file object to the end, i guess you want to use readline() 
instead or the builtin raw_input.

> print 'passed'
>
> if I run
> script1.py | script2.py
> all goes well.
This is because when script1.py ends, it will send an 'EOF' char to 
script2.py, wich terminate the read method.

>
> But if I run just
> script2.py
> the program blocks waiting forever for input.
here, newlines ('\n'), doesn't terminate the read call, you can stop the read 
by typing ctrl+d at the beginnning of a new line in a normal unix terminal.


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Maric Michaud
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