[Python-Dev] Python interpreter crash.

2002年3月12日 23:37:56 -0500

[Fred Drake]
> The first four bytes represent a magic number, and the
> second four bytes represent the date on which the bytecode
> was compiled (or was it the timestamp of the source file?).

The source file: a .py[co] is out of date if the source file changed since
the .py[co] was created, so the source file's original time is the
interesting thing. You might think <wink> we could compare mtime(.py[co])
to mtime(.py), but apart from pathologies that would require two stat()
calls; only one is needed the way it's done.
> It's gotta be in the docs somewhere, else I'd have to just
> remember all that! ;-) Seriously, if you don't see it in
> the docs, file a bug report and tell me where you looked &
> why; it probably means there's something missing, if only a
> link to wherever it actually is.

See my response -- I'm not sure this *should* be documented. The "first 4
bytes form a magic number" can probably never be changed (and is documented
now), but changing the rest has been debated repeatedly (albeit never acted
on).