invoking lily from python

[andrea valle]

Dear all,

I'm calling lily from inside IDLE of Python, using module os with 
function os.system. I post this as I know Python is largely used among 
lilyponders.
The same command line (/sw/bin/lilypond /Users/apple/Desktop/test.ly) 
from shell and from os.system gives two different results.

From shell it works perfectly (obviously).
(apples-Computer:~ apple$ /sw/bin/lilypond /Users/apple/Desktop/test.ly)


From os.system I have as output only the file test.tex, which is ok, 
but there are no other files. os.system ends with 0, which means all 
was ok.

>>> cmd="/sw/bin/lilypond /Users/apple/Desktop/test.ly"
>>> os.system(cmd)
0

Should I call explicitly the "convert" part to which lily refers 
printing on screen the following lines in command line mode?

Converting to `test.dvi'...
Converting to `test.ps'...
Converting to `test.pdf'...

It seems to me that this part is skipped when invoking from IDLE.

Any hints?

Thanks a lot
-a-