I read the django documentation, and I realised that both commands ( self.
__class__()._meta.get_field('{0}'.format(field_name)) and self._meta.
get_field(field_name) ) did return the right object, the problem was when I
tried to access the verbose_name.
And after testing some more, I understood that it is because my verbose
names have non ASCII caracters (for exemple, the verbose_name for phone is
"N° de téléphone"), and that explains why it cancels the display of the
whole string in which it is, and also why it doesn't raise an exception
(because all the objects I want to access do exist).
So..it is a simple encoding problem...
Of course, in my models.py file was encoded with utf-8, but it wasn't
enough.
I had to add an import :
from __future__ import unicode_literals
(see
https://docs.djangoproject.com/en/1.8/ref/unicode/#general-string-handling)
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