[ python-Bugs-1690103 ] trace module borks __file__

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Bugs item #1690103, was opened at 2007-03-28 21:05
Message generated for change (Comment added) made by zseil
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Category: Python Library
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Skip Montanaro (montanaro)
Assigned to: Nobody/Anonymous (nobody)
Summary: trace module borks __file__

Initial Comment:
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...


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>Comment By: Ziga Seilnacht (zseil)
Date: 2007-04-15 20:39

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Wouldn't it be better for trace.main() to call
Tracer.runctx() instead of Tracer.run()?  That
way you could use a copy of __main__.__dict__
for locals and globals and overwrite the filename
there.  Note that your solution would still report
the wrong filename if someone called tracer.main()
from his own main script.

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Comment By: Skip Montanaro (montanaro)
Date: 2007-03-28 22:38

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Hmmm...  Maybe not so hard after all.  See attached diff.  Does anyone see
a problem with simply overwriting the trace module's __file__ attribute?

File Added: trace.diff

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Comment By: Skip Montanaro (montanaro)
Date: 2007-03-28 22:01

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I believe this is because the trace module calls execfile()
to run the file.  I'm not sure if there's an easy fix for
this problem.

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