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Re: Ubuntu: I can't reproduce the problem. At this point, I consider this problem Windows XP-only.
Re: Windows & bash: I decided to verify that this problem occurs even if running outside of Bash in 
the native (and wonderful) shell CMD.EXE. It *does* occur. Here's the state:
[1] Run my script in Bash, which fails as in my previous append from today.
[2] Start CMD.EXE. Then run a "touch b.py" in Bash, then verify using Bash "ls -l" that b.py is 
protection 444 (readonly).
[3] In CMD.EXE, run "python -v a.py" (I don't know how to use something like grep in CMD.EXE, so I 
just manually copy/pasted the "python -v" lines.) The following lines in CMD.EXE's output show that 
the problem still occurs in CMD.EXE:
# C:\Documents and Settings\psimanyi\b.pyc has bad mtime
import b # from C:\Documents and Settings\psimanyi\b.py
# can't create C:\Documents and Settings\psimanyi\b.pyc
b
# clear __builtin__._
If you are unable to reproduce this on XP, I will be happy to help.
I would not be surprised if this had something to do with the granularity of mtime or some other 
oddity of Windows, because: if I delete the sleep in the Bash script, then rerun the Bash script very 
quickly using "control-P control-J" typed ahead, sometimes the Bash script fails and sometimes it 
succeeds! (Nice work, Windows.)
Thanks much.