Django Form - Custom ModelChoiceField label

custom_modelchoicefield.py

from django import forms
from django.utils.safestring import mark_safe

class CustomModelChoiceField(forms.ModelChoiceField):
    def label_from_instance(self, obj):
        return mark_safe("My Object custom label <strong>%i</strong>" % obj.id)


class MyForm(forms.ModelForm):
    my_field = CustomModelChoiceField(label=_('The form label'), queryset=MyModel.objects.filter(), widget=forms.RadioSelect, empty_label=None)
    class Meta:
        model = MyModel

I am sorry, but I am still relatively new to python and Django, what is the purpose of the underscore in line 10 when declaring label?

I am sorry, but I am still relatively new to python and Django, what is the purpose of the underscore in line 10 when declaring label?

I think it might be for internationalization