[Python-ideas] automation of repr/str for all the common simple cases

Wed Feb 15 15:32:10 CET 2012

Hi,
in my experience for many cases, __repr__ and __str__ can be 
unconditionally be represented as simple string formatting operation,
so i would propose to add a extension to support simply declaring them 
in the form of newstyle format strings
a basic implementation for __repr__ could look like:
 class SelfFormatter(string.Formatter):
 def __init__(self, obj):
 self.__obj = obj
 string.Formatter.__init__(self)
 def get_value(self, key, args, kwargs):
 if isinstance(key, str) and hasattr(self.__obj, key):
 return getattr(self.__obj, key)
 return Formatter.get_value(self, key, args, kwargs)
 class SimpleReprMixing(object):
 _repr_ = '<{__class__.__name__} at 0x{__id__!x}>'
 def __repr__(self):
 formatter = SelfFormatter(self)
 return formatter.vformat(self._repr_, (), {'__id__':id(self)})
-- Ronny Pfannschmidt

[Python-ideas] automation of __repr__/__str__ for all the common simple cases

[Python-ideas] automation of repr/str for all the common simple cases