[Tutor] Have any idea why I do not have access to MY files?

[hcohen2]

These are excution functions: system() and popen().  For the same file 
with the former I can see the contents:

 >>> result = os.system('cat new2text.py')
y = 0
print 'y is currently:', y
while y < 8:
    y += 1
    print 'incrementing y to: ', y
 
whereas, if I try to read it - suddenly it does not belong to me!

 >>> f = os.popen('import2.py -a')
 >>> sh: line 1: ./import2.py: Permission denied

But if I do this, its mine!

 >>> result = os.system('ls -l new2text.py')
-rw-r--r--    1 prime_dev prime_dev       93 Jan 26 11:09 new2text.py

Adding a full path has no effect, with popen() still claims I have no 
rights.

Thanks for any insights!