[Python-Dev] Reading Python source file

[Guido van Rossum]

Yeah, let's kill this undefined behavior.

On Thu, Nov 19, 2015 at 4:10 AM, Chris Angelico <rosuav at gmail.com> wrote:
> On Thu, Nov 19, 2015 at 10:51 PM, Serhiy Storchaka <storchaka at gmail.com> wrote:
>> http://bugs.python.org/issue20115
>
> Interestingly, the file linked in the last comment on that issue [1]
> ties in with another part of this thread, regarding binary blobs in
> Python scripts. It uses open(sys.argv[0],'rb') to find itself, and has
> the binary data embedded as a comment. (Though the particular
> technique strikes me as fragile; to prevent newlines from messing
> things up, \n becomes #% and \r becomes #$, but I don't see any
> protection against those sequences occurring naturally in the blob.
> Given that it's a bz2 archive, I would expect any two-byte sequence to
> be capable of occurring.) To be quite honest, I wouldn't mind if
> Python objected to this kind of code. If I were writing it myself, I'd
> use a triple-quoted string containing some kind of textualized version
> - either the repr of the string, or some kind of base 64 or base 85
> encoding. Binary data embedded literally will prevent non-ASCII file
> encodings.
>
> ChrisA
>
> [1] http://ftp.waf.io/pub/release/waf-1.7.16
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-- 
--Guido van Rossum (python.org/~guido)