# implements_to_string class decorator that helps implementing classes with __unicode__ or __str__ methods
# Based on: http://lucumr.pocoo.org/2013/5/21/porting-to-python-3-redux/
# However, the code below is supposed to work for an arbitrary encoding, not just utf-8

import sys

isPy3k = sys.version_info[0] == 3

if isPy3k:
    implements_to_string = lambda x: x
else:
    print "you're using Python 2"
    def implements_to_string(cls):
        class Klass(cls):
            def __init__(self, *args, **kwargs):
                super(Klass, self).__init__(*args, **kwargs)
                print "defining __unicode__"
                cls.__unicode__ = cls.__str__
                print "defining __str__, which uses %s encoding" % self.encoding
                cls.__str__ = lambda x: x.__unicode__().encode(self.encoding)
        return Klass

@implements_to_string
class Test(object):

    @property
    def encoding(self):
        """In reality this method extracts the encoding from a file"""
        return "rot13"

    def __str__(self):
        return "str called"

if __name__ == "__main__":
    t = Test()
    print unicode(t)
    print str(t)