Strange PHP/Python problem

[Adrian Price-Whelan <adrian.prw@xxxxxxxxx>]

Hey all-

Something strange is happening with a python script I am executing  
from a php page:
I am executing this by doing $output = `python blahblah.py arg1 arg2  
arg3`

Say my Python code looks like this:
import sys
import os

thisPID = os.getpid()
print thisPID

print "1"

RADeg = float(sys.argv[1])
decDeg = float(sys.argv[2])
clipSizeDeg = float(sys.argv[3])

print "2"

ic.myFunction(RAdeg, decDeg, clipSizeDeg)

print "3"

os.system(SOME LONG COMMAND)

print "4"

for i in os.listdir(blah):
     print "5"
     os.system("gunzip BLAH")[/code]

print "6"

$output collects these numbers from the print statements, all the way  
through #6, but it doesn't execute the rest of the code - the stuff  
that I actually want it to do...any ideas?

Thanks!