[Tutor] Puzzled by execfile(): solved (?)

[André Roberge]

Dear Tutors,

(I won't repeat the whole message, which you should just have gotten - 
or is above in the digest version)

I changed the first script, added a third and it now works the way I 
expect when I run the third.  Below is my attempt at explaining what 
happened - I would really appreciate any correction!

===Script1.py ===
def printfoo():
    print "foo"
def run_test():  # this line is the only change, other than indent
    execfile("Script2.py")

===Script2.py===           # no change here
from Script1 import *
print "starting"
printfoo()
print "done"

====Script3.py======
from Script1 import *
run_test()
=====================

Before, when I ran script1 (without the def run_test()),
execfile(...) was run *once* when Script2 was executed and imported 
Script1 in turn.  So, execfile was first run from the "import" statement 
in Script2, and then from its natural place in Script1.
Since modules are only imported once, on subsequent runs, the import 
statement in Script2 was ignored, and I got the expected behaviour.

Now, in this new version, Script1 only contains definitions.  When it is 
imported in Script2 [line 1], nothing is printed.  When lines 2-4 are 
executed, I get the three printed lines, i.e.

starting
foo
done

which is what I wanted.

Is this close to being correct?

André Roberge