Op donderdag 17-06-2010 om 14:48 uur [tijdzone -0700], schreef Stephen
Hansen:
> On 6/17/10 2:40 PM, Laurent Verweijen wrote:
> > Op donderdag 17-06-2010 om 14:36 uur [tijdzone -0700], schreef Stephen
> > Hansen:
> >> On 6/17/10 2:09 PM, Laurent Verweijen wrote:
> >>> It just gives me an empty string.
> >>>
> >>> Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41)
> >>> [GCC 4.4.3] on linux2
> >>> Type "help", "copyright", "credits" or "license" for more information.
> >>>>>> from asynchronous import *
> >>>>>> p = Popen(["python", "increment.py"], stdin=PIPE, stdout=PIPE)
> >>>>>> send_all(p, "5\n")
> >>>>>> recv_some(p)
> >>> ''
> >>>>>> send_all(p, "6\n")
> >>>>>> recv_some(p)
> >>> ''
> >>
> >> Yes, that's how it signals the same situation. The point is: your
> >> subprocess isn't outputting anything. You sure its not crashing out, for
> >> instance?
> >>
> >
> > No, since it responds to the keyboard:
>
> That doesn't really prove the point. There's all kinds of things that
> can go wrong when you switch how you run a program.
>
> Wrap your increment.py in like:
>
> import sys
> import traceback
>
> try:
> ...
> except:
> print >>sys.stderr, traceback.format_exc()
>
> Then add the arg in your Popen, stderr=sys.stderr
>
> And see if any exception is thrown.
>
> The original error you got, and the empty string from the recipe, both
> mean interpret.py is not returning any output. Why? Maybe its erroring
> out-- the subprocess context is different then the context of running a
> program from the keyboard. Or maybe you're not sending:
I did exactly what you said, here is the result:
prompt:~$ python subchronous_test.py
Traceback (most recent call last):
File "increment.py", line 7, in <module>
n = int(raw_input(str(n))) + 1
EOFError: EOF when reading a line
prompt$ close failed in file object destructor:
Error in sys.excepthook:
Original exception was:
>
> In your other thread you include an actual traceback:
>
> Traceback (most recent call last):
> File "subchronous_test.py", line 5, in <module>
> send_all(str(p), n)
> File "/home/Somelauw/asynchronous.py", line 145, in send_all
> while len(data):
> TypeError: object of type 'int' has no len()
>
> The first argumetn to send_all should be the actual Popen subclass. The
> second should be a string to send. I think that line really is intended
> to be:
>
> send_all(p, str(n)) # assuming 'n' is say, the number 5.
>
You are right, I swapped the parameters, but even if I correct it, it
still gives the second error.
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