Decisions on selcting ChoiceField

# views.py

def price_choices(request):

    if request.method == "GET":

        context = {} 

        context['form'] = pricechoice() 

        return render( request, "template_form.html", context)

# forms.py

price_CHOICES =( 

    ("1", "25"), 

    ("2", "50"), 

    ("3", "100"), 

    ("4", "200"), 

) 

class pricechoice(forms.Form): 

    pricechoice = forms.ChoiceField(choices = price_CHOICES,  widget=forms.RadioSelect()) 

# template

<form method = "GET"> 

    {{ form }}

</form>

If choice 25 is selected, i want it make a calculation.
How can i do it ?

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