Brett Cannon added the comment:

The rationale is that was the way it already was prior to importlib.

As for the approach you are suggesting, I am understand it, it will just
not give the public method the same functionality which might not be that
On Nov 18, 2012 5:18 AM, "Nick Coghlan" <> wrote:

> Nick Coghlan added the comment:
> The suppression flag rings alarm bells for me, as does the fact that all
> the arguments are optional. Do you remember the rationale for allowing the
> marshalling errors to propagate rather than falling back to loading from
> source? It seems weird that a truncated read in the first 12 bytes means to
> fall back to compiling from source, but truncation after that is a user
> visible error. Allowing those exceptions to be suppressed as well would
> simplify things a fair bit.
> Regardless, looking at the full patch in context on a real computer
> (rather than through my phone), suggests to me there needs to be *two*
> private static methods on _LoaderBasics._parse_bytecode_file:
>     _validate_bytecode_header
>     _unmarshal_code
> SourcelessLoader.get_code would just call these directly, while
> SourceLoader.parse_cache_contents would suppress exceptions from the first
> one.
> I'll put together a patch illustrating this approach.
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