I have also noticed this,
and I routinely define python functions to be called from py opcodes
with a bogus argument, like "def test(bogus):"
best
Oeyvind

2007/11/3, Lou Cohen <loucohen@jolc.net>:
> I'm using csound 5.04 on PPC Mac OS X 10.4.10 to interact with python and
> I've run into a small problem. This note is to check if this is a bug, maybe
> already fixed, or if I misunderstand something.
>
> If I define a python function to have no input parameters (and one result,)
> it seems that csound dies when I try to invoke that function using pycall1i.
> Below is my csound code, followed by the terminal output. You will see that
> everything works as it should until the final pycall1i line, at which point
> csound halts (sometimes crashes.)
>
> Clearly I can work around this by always defining at least one input
> parameter for a python function, even if I ignore it, but I want to be sure
> I haven't misunderstood something...
>
> thanks,
> Lou
>
>
> <CsoundSynthesizer>
> <CsInstruments>
> ;</CsOptions>
> ; Select audio/midi flags here according to platform
> ; Audio out   Audio in    No messages
> ;-odac           -iadc    ; -d     ;;;RT audio I/O
> ; For Non-realtime ouput leave only the line below:
> ; -o linseg.wav -W ;;; for file output any platform
> ;</CsOptions>
> ;<CsInstruments>
> ;*******************************
> sr=48000
> kr=480
> ksmps=100
> nchnls=1
>
> pyinit
>
> ;define a function that ignores its input parameter d and uses globals a,b
> pyruni {{
> def myfun(d):
>     c=a+b
>     return c
>
> }}
>
> ;define a function that has no input parameter, only uses globals a,b
> pyruni {{
> def myotherfun():
>     c=a+b
>     return c
>
> }}
>
> ;use python to set globals a, b and call both functions
> ; also use python to print the outputs of the functions.
> pyruni {{
> a=1
> b=2
> print "myfun=", myfun(6)
> print "myotherfun=", myotherfun()
> a=1000
> print "myfun=", myfun(6)
> print "myotherfun=", myotherfun()
> }}
>
> ;use csound to set one of the python globals
> pyassigni    "a", 64
> ;use pyruni to call the function with the dummy input parameter
> pyruni        {{print "myfun=", myfun(6)}}
>
> ;use pyruni to call the function with no input parameter
> pyruni        {{print "myotherfun=", myotherfun()}}
>
> ;use pycall1i to call the function with the dummy input parameter
> ic        pycall1i    "myfun", 1
> ;use csound to print the result
> print        ic
>
> ;use pycall1i to call the function that has no input parameter (never gets
> here, or crashes here!)
> iotherc        pycall1i    "myotherfun"
> print        iotherc
>
> instr 1
> endin
> </CsInstruments>
> <CsScore>
> f 0 900000 ;dummy table for realtime input
> i 1 0 10000
> e
> </CsScore>
>
> </CsoundSynthesizer>
> ----------------------------------------
> terminal output:
>
> Csound version 5.04.0 (float samples) Nov 10 2006
> 0dBFS level = 32768.0
> myfun= 3
> myotherfun= 3
> myfun= 1002
> myotherfun= 1002
> myfun= 66.0
> myotherfun= 66.0
> instr 0:  ic = 66.000
> Csound tidy up: Bus error
> inactive allocs returned to freespace
> end of score.              overall amps:      0.0
>            overall samples out of range:        0
> 0 errors in performance
> Elapsed time at end of performance: real: 0.906s, CPU: 0.090s
>
> ---------------------------
> Permanent email:           loucohen@jolc.net
> Music and video:
> http://ruccas.org/wiki.pl/Lou_Cohen
> More music and video:      http://www.youtube.com/loucohen
> Astronomy:                 http://www.jolc.net
> ----------------------------
>
>