pyax team mailing list archive

[Mr Python <raychorn@xxxxxxxxxxx>]

I have run into the str() and __repr__() problem many times while coding my 
huge (125,000+ lines) library of reusable code and I have had to code around 
it by ensuring I never issue a str() during a __repr__() when the result can 
be recursive.

See also the following from a quick Google search:

[Python-3000] PEP: str(container) should call str(item), not repr ... --> 
http://mail.python.org/pipermail/python-3000/2008-May/013876.html

http://www.google.com/search?rlz=1C1GGLS_enUS291US304&sourceid=chrome&ie=UTF-8&q=str+and+__repr__+for+python

Enjoy. :-)

--------------------------------------------------
From: "Kevin Shuk" <surf@xxxxxxxxxxxxx>
Sent: Thursday, January 22, 2009 2:37 PM
To: <raychorn@xxxxxxxxxxx>
Subject: [Bug 319792] Re: clist has a bug that limits how a clist instance 
canbe used.

> Thank you for the report & suggested fix. I did not realise the bit
> about str() using __repr__() - learn something new every day!
>
> My plan is to come up with a test case that shows the broken behavior,
> then apply your suggested fix and merge into trunk as soon as possible.
>
> ** Changed in: pyax
>   Importance: Undecided => Medium
>     Assignee: (unassigned) => Kevin Shuk (surf)
>       Status: New => In Progress
>
> -- 
> clist has a bug that limits how a clist instance can be used.
> https://bugs.launchpad.net/bugs/319792
> You received this bug notification because you are a direct subscriber
> of the bug.
>
> Status in Salesforce.com Apex API library for Python: In Progress
>
> Bug description:
> clist uses the following method however __repr__ methods must take care to 
> use some method other than the str() method when producing a 
> representation of a clist because the method below causes stack overflow 
> problems at runtime.
>
>
>    def __repr__(self):
>        return "clist(%s)" %str(self)
>
> A better method would be to represent the clist as a list of items rather 
> than as a representation of the whole list.
>
> This bug affects how clist instances get handled by a method that needs to 
> represent the clist - this does not happen often however when it does 
> happen the method above fails.
>
> The reason is str() uses __repr__() - this is common for all Python 
> objects that seek to use str() to form a representation of an object where 
> the item being rendered by str() is the object itself.
>

-- 
clist has a bug that limits how a clist instance can be used.
https://bugs.launchpad.net/bugs/319792
You received this bug notification because you are a member of pyax
Developers, which is the registrant for pyax.