Why the file mode of .pyc files has x?

[greg]

Peng Yu wrote:
> -rw------- 1 pengy lilab  29 2009-09-26 10:10:45 main.py
> -rwx------ 1 pengy lilab 106 2009-09-26 10:19:17 test.py
> -rwx------ 1 pengy lilab 339 2009-09-26 10:20:39 test.pyc

Doesn't happen for me with 2.5 on Darwin.

What python/OS are you using?

-- 
Greg