[Python-Dev] PEP 318 bake-off?
bkc at murkworks.com
Thu Apr 1 14:28:28 EST 2004
On 1 Apr 2004 at 11:08, Guido van Rossum wrote:
> I think that SPARK syntax and everything else that people have
> traditionally added to docstring markup that isn't strictly speaking
> documentation (even some extreme cases of doctest usage) ought to be
> considered as candidates for attribute-ification.
Where do method attribute type signatures and DBC fit in? As a decorator, or in the
I'm concerned that the funcattrs(a="xyz" .. ) sample tossed around here will be rather
ugly for specifying DBC strings.
DBC will also need class invariants, so a funcattrs work-alike at the class level will be
Finally, I don't have a need to access DBC annotations at runtime once my module is
distributed. I would not want to pay the memory cost overhead of loading DBC
information or attribute type signatures at runtime.
However another person at PyCon poo-poo'd my concern over bloating .pyc files and
subsequent memory use. As a compromise I suggested that "annotation" information
could go into the .pyc, but be loaded "on demand" at runtime. For example, a traceback
handler might be able to use DBC info to suggest the call level that may have caused
To do "on demand loading", I suggested giving .pyc files a "resource section" that could
hold this meta information. Normal imports would not load the resource section, but
resource information could be loaded later using another mechanism.
I thought that putting meta data into a different file was more complicated, and that
using -OO to "strip out" annotation was too heavy handed. The standard library might
benefit from the addition of method attribute type information. However I think it would
be better to not load this information at runtime unless needed.
The same could be said for docstrings. If docstrings were "packed" in a resource
section of the .pyc file, they might be loaded "on-demand", thereby saving some
Brad Clements, bkc at murkworks.com (315)268-1000
http://www.murkworks.com (315)268-9812 Fax
http://www.wecanstopspam.org/ AOL-IM: BKClements
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