Re: Extending built-in function unicode

PEAK-Rules only works on functions with code objects. <unicode> isn't
a function at all, it's a type. Also, it's a builtin, implemented in
C, so you can't extend it. Also if types is the types module, then
types.ClassType isn't some Django specific type, it's a builtin type
for old-style classes. It also seems that you don't know about
__repr__ / __str__ / __unicode__ methods.

I'd suggest to try Python manual first.

http://docs.python.org/library/index.html


Anyway, to override __unicode__ for a class, you'd need to change its
metaclass which I'm not sure even possible for existing classes.



On Mon, Oct 6, 2008 at 14:56, Rajeev J Sebastian
<[email protected]> wrote:
> Hi,
>
> I'm using PEAK_Rules-0.5a1.dev_r2576-py2.4
>
> I get an exception when trying to "extend" the unicode function:
>
> @when(unicode, (types.ClassType,))
> def unicode_model(m):
>    return m._meta.app_label+'.'+m._meta.object_name
>
>
> ( this is to print a good string when the object 'm' is a django model class)
>
> However, I get something like:
>
> AttributeError: type object 'unicode' has no attribute 'func_code'
>
> when this code loads.
>
> It seems this is because 'unicode' is not a python function (?). Could
> someone suggest a better way to achieve this ?
>
> Regards
> Rajeev J Sebastian
>
>
> Partial Traceback:
>  File "build\bdist.win32\egg\peak\util\decorators.py", line 600, in do_decorate
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 185, in callback
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 309, in rules_for
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 547, in callback
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 153, in __call__
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 312, in rules_for
>  File "build\bdist.win32\egg\peak\util\addons.py", line 55, in __call__
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 334, in __init__
>  File "/usr/lib/python2.4/site-packages/PEAK_Rules-0.5a1.dev_r2576-py2.4.egg/peak/rules/core.py",
> line 358, in _regen_code
>  File "build\bdist.win32\egg\peak\util\assembler.py", line 858, in
> from_function
> AttributeError: type object 'unicode' has no attribute 'func_code'
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>



-- 
Best Regards,
Sergey Schetinin

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