AttributeError: 'Person' object has no attribute 'get'

Good day community. I have a problem when saving the data of a form of type ModelForm. And it is that when you sent the data of the form to my database the following error appears:

AttributeError at /Usuario/
'Persona' object has no attribute 'get'

Then I attach the code of my form, view and template.

Form:

class PersonaForm(ModelForm):

    class Meta:
        model = Persona
        fields = '__all__'

    def __init__(self, nombre, *args, **kwargs):
        super(PersonaForm, self).__init__(*args, **kwargs)
        self.fields['nombre'].initial = nombre   

View:

def index(request):

    nombre = Persona.objects.get(pk = 5)

    if request.method == 'POST':
        form = PersonaForm(request.POST or None,nombre)
        if form.is_valid():
            form.save()
            return redirect('Usuario:index')
    else:
        form = PersonaForm(nombre)

    context = {
        'form':form,    
    }

    return render(request, 'index.html', context)

Models:

class Nacion(models.Model):
     pais = models.CharField('Nombre pais', max_length=50)

     def __str__(self):
         return self.pais

class Persona(models.Model):
    nombre = models.CharField('Nombre', max_length=50)
    apellido = models.CharField('Apellido', max_length=50)
    edad = models.IntegerField('Edad')
    nacionalidad = models.ForeignKey(Nacion, verbose_name=("Nacion"), on_delete=models.CASCADE)

    def __str__(self):
        return self.nombre

Template:

<form method="post" action="">{% csrf_token %}
{{ form.as_p }}
<input type="submit" value="Enviar">
</form>

Basically I'm having problems saving my form, I think because there's something in my function __init__ that I'm not doing right, what I want with this code is to generate arguments in the form and those to pass them in the view.

I add the image of the error that appears in the browser, it is line 14 of the view: