[New-bugs-announce] [issue13224] Change str(class) to return only the class name
report at bugs.python.org
Wed Oct 19 21:44:55 CEST 2011
New submission from Éric Araujo <merwok at netwok.org>:
Suggestion by Guido on #868845:
Off-topic: I sometimes wish that the str() of a class would return the class name rather than its repr(); that way "print(str)" would print "str" instead of <class 'str'>. (Use case: printing an exception and its message: I wish I could print("%s: %s" % (err.__class__, err)) instead of having to use err.__class__.__name__.) One could even claim that the repr() of a class could be the same, since one of the guiding principles for repr() is that it should, if possible, return an expression that (perhaps given a suitable environment) could reconstruct the value exactly (and otherwise it should have the <...> form discussed in this issue). But both of these wishes are debatable, and if anyone cares, they should open a new bug to discuss it.
> I sometimes wish that the str() of a class would return the class name
> rather than its repr(); that way "print(str)" would print "str"
> instead of <class 'str'>. (Use case: printing an exception and its
> message: I wish I could print("%s: %s" % (err.__class__, err)) instead
> of having to use err.__class__.__name__.)
I wrote a simple patch for that. I just copied the definition of type_repr to a new type_str function, edited the format strings and updated the member mapping (I checked in another file than casting to reprfunc is okay for a str func). It compiles and runs just fine, but I’m still learning C, so there may be things I’ve missed: I don’t know if I have to declare the new function or something like that. The test suite passes with very few edits.
Guido added this:
> One could even claim that the repr() of a class could be the same
I for one think of repr first as “string form for debugging”, so I like the angle brackets. My patch leaves __repr__ alone.
If this get approved, I’ll update my patch with doc changes. If there is no feedback I’ll go to python-ideas.
components: Interpreter Core
stage: patch review
title: Change str(class) to return only the class name
type: feature request
versions: Python 3.3
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