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If you look in the import statements, you’ll find that they tied _ to a function that turns stuff into unicode and localizes it by writing:
from django.utils.translation import ugettext_lazy as _
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_ in Django is a convention that is used for localizing texts. It is an alias for ugettext_lazy. Read Lazy translation in the docs for more info about it.
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_ is usually a macro/function from gettext, it means the argument is a localized string. this is not limited to Django or Python. in fact gettext is originally a package for C programs, ported to many other languages over the years.
Source:stackexchange.com