[Python-Dev] PEP 3147: PYC Repository Directories

[Barry Warsaw]

On Feb 01, 2010, at 02:04 PM, Paul Du Bois wrote:

>It's an interesting challenge to write the file in such a way that
>it's safe for a reader and writer to co-exist. Like Brett, I
>considered an append-only scheme, but one needs to handle the case
>where the bytecode for a particular magic number changes. At some
>point you'd need to sweep garbage from the file. All solutions seem
>unnecessarily complex, and unnecessary since in practice the case
>should not come up.

I don't think that part's difficult.  The byte code's only going to change if
the source file has changed, and in that case, /all/ the byte code in the "fat
pyc" file will be invalidated, so the whole thing can be deleted by the first
writer.  I'd worked that out in the original fat pyc version of the PEP.

-Barry
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