Django - How to call a session in a module different than views.py?

I'd like to call a session that was set at views.py in my forms.py. Is that possible?

I tried to do that but I faced some issues with 'request'.

forms.py

from django import forms


class NormalForm(forms.Form):

   options = [
       ('TEST','TEST'),
   ]

   options_normalform = forms.ChoiceField(required=False, choices=options,widget=forms.RadioSelect(attrs={'class':'example_form'}), label='')

class ExampleForm(forms.Form):

   def __init__(self, *args, **kwargs):
       self.request = kwargs.pop('request', None)
       super(ExampleForm, self).__init__(*args, **kwargs)

       self.option_a = self.request.session['my_session']

    self.options_list = [
        ('a', self.option_a),
        ('b', 'b'),
        ('c', 'c'),
    ]

    self.options_form = forms.ChoiceField(required=False, choices=self.options_list,widget=forms.RadioSelect(attrs={'class':'example_form'}), label='')

views.py

from django.shortcuts import render
from .forms import ExampleForm, NormalForm

def example(request):
    option_a = '123'
    request.session['my_session'] = option_a

    normalform = NormalForm
    form = ExampleForm(request=request)
    context = {
        'form': form,
        'normalform': normalform,
    }

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

template

<!DOCTYPE html>
<html>
    <head>
        <title>My App</title>
    </head>
    <body>       
        <!-- Header -->
        <header>
            <h1 id="logo">MY APP</h1>
        </header>


        <!-- Options form -->
        <div id="forms">
            <form id="normalform" method="post">
                {% csrf_token %}
                {{normalform}}
            </form>
            <form id="form" method="post">
                {% csrf_token %}
                {{form}}
            </form>
        </div>
        <!-- End of options form -->


        <!-- Footer -->
        <footer id="main-footer">
            <p>Copyright &copy; 2017-2017 | my APP </p>
        </footer>
        <!-- End of Footer -->
    </body>
</html>

I don't try to import the value instead of make a session, because this value will be created inside the same view that I call the form. Therefore I would get a circular error.

I hope that to store this value in a session, and then send it to my form will not raise this circular issue.

P.S. I'm a beginner on programming.

[EDITED] It was included the template and a new form to test if the view is able to find the template.

Solution

First of all, we rewrite the form class so it receives the request object in the constructor and stores it in a field. All the other properties will be initialized after that:

class ExampleForm(forms.Form):

    def __init__(self, *args, **kwargs):
        self.request = kwargs.pop('request', None)
        super(ExampleForm, self).__init__(*args, **kwargs)

        self.option_a = self.request.session['my_session']

        self.options_list = [
            ('a', self.option_a),
            ('b', 'b'),
            ('c', 'c'),
        ]

        self.fields['options_form'] = forms.ChoiceField(required=False, choices=self.options_list, widget=forms.RadioSelect(attrs={'class':'example_form'}), label='')

Now, in your view you have to instantiate a form object and pass the request in the constructor call. Note that the context should receive a form instance and not the class or the form will not be rendered:

def example(request):
    option_a = '123'
    request.session['my_session'] = option_a
    form = ExampleForm(request=request)
    context = {
        'form': form,
    }
    return render(request, 'example/index.html', context)