python - Django: How to have multiple "add another field" buttons in a form -

i'm new django , i'm having lot of trouble forms.

i'm making calculation-based tool , need able have arbitrary number of inputs.

as basic example, let's want make calculator sum , subtract number of inputs. each number added or subtracted in own number field. both list of "adding" fields , list of "subtracting" fields has own "add field" button.

for starters, here's adds 2 inputs (since can't figure out how implement 1 "add field button" or understand answer it).

views.py

from __future__ import unicode_literals  django.http import httpresponse, httpresponseredirect  django.shortcuts import render django.views.decorators.csrf import csrf_exempt  .forms import addform   def _from_str(s):     try:         s = int(s)     except valueerror:         try:             s = float(s)         except valueerror:             pass     return s   @csrf_exempt def web_adder(request):     if request.method == 'post':         form = addform(request.post)         # form = myform(request.post, extra=request.post.get('extra_field_count'))         if form.is_valid():             return web_adder_out(request, _from_str(form.cleaned_data['addend0']), _from_str(form.cleaned_data['addend1']))      else:         form = addform()         # form = myform()     return render(request, 'addercontent.html', {'form': form})   def web_adder_out(request, a, b):     return render(request, 'addercontentout.html', {'content':[a + b]}) 

forms.py

from django import forms   class addform(forms.form):     addend0 = forms.charfield(label='first addend', max_length=100)     addend1 = forms.charfield(label='second addend', max_length=100) 

addercontent.html

{% block content %} <p>this web adder</p> <form action="" method="post">     {% csrf_token %}     {{ form.as_p }}     <button type="submit" class="btn btn-default">enter</button> </form> {% endblock %} 

addercontentout.html

{% block content %}     {% c in content%}     result: {{c}}     <br>     <a href="/" class="btn btn-default">return</a>     {% endfor %} {% endblock %} 

don't use django field generation. of via html. run setup have, , should able @ page source see how inputs structured. can manually write form in html, javascript adding fields in needed.