Stick this in a file (say, printfile.py):

    print __file__

If I run it as "python printfile.py" using Python 2.4, 2.5 or 2.6 it prints as expected, e.g.:

    % python ~/tmp/printfile.py
    /Users/skip/tmp/printfile.py

If, however, I run it under control of the trace module I get something entirely different:

    % python -m trace --count ~/tmp/printfile.py
    /Users/skip/local/lib/python2.6/trace.py
    % python -m trace --trace ~/tmp/printfile.py
     --- modulename: threading, funcname: settrace
    threading.py(70):     _trace_hook = func
     --- modulename: trace, funcname: <module>
    <string>(1):   --- modulename: trace, funcname: <module>
    printfile.py(1): print __file__
    /Users/skip/local/lib/python2.6/trace.py

Definitely looks buggy to me...