lazy() may need a __repr__ for Python 2

[jdh13]

in python2:

>>> from django.apps import apps
>>> apps.get_app_config('admin').verbose_name

displays:

<django.utils.functional.__proxy__ object at 0x2c24c10>

instead of name

[Baptiste Mispelon]

(the doc is here: ​https://docs.djangoproject.com/en/dev/ref/applications/)

Interestingly, doing print(apps.get_app_config('admin').verbose_name) still gives a useless repr on python2 under 1.7.
On master or on Python 3, you get the expected behavior ("admin" is printed, or a translation in your active language).

[Baptiste Mispelon]

For what it's worth (I'm not sure if there's an actual bug to be fixed here), I bisected the print issue to ea3e40c278eb27fb3c8362d9e8cd67f957bf4f57.

[Tim Graham]

I think the root cause is related to #25000 (I could reproduce the issue on master with Python 2). Adding a __repr__() method similar to the __str__() method added in the linked ticket seems to fix the issue:

def __repr__(self):
    return repr(self.__cast())

Not entirely sure that's the proper solution.

[Chesco Igual]

​https://github.com/django/django/pull/6710

[Tim Graham <timograham@…>]

In ffd1873:

Fixed #24781 -- Fixed repr() for lazy objects.