How to pass user data to variable in Django widget?

Question

Django

Good day, I hope you can help me. There is a small script for displaying the widget, but I can’t understand how to accept the value selected by the user and pass it to a variable with subsequent use, please tell
me Views.py

def countries_view(request):
    if request.method == 'POST':
        form = CountryForm(request.POST)
        if form.is_valid():
            countries = form.cleaned_data.get('countries')
            # как принять значение ?
    else:
        form = CountryForm

    return render('index.html', {'form': form})

models.py

class CountryForm(forms.Form):
    OPTIONS = (
        ("AUT", "Austria"),
        ("DEU", "Germany"),
        ("NLD", "Neitherlands"),
    )
    Countries = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple, choices=OPTIONS)