i want to save is_staff value true in db but not save in database

Advance Thanks for your help:

is_staff  value is not save in database

Here is Code:

from django.contrib.auth import login, authenticate

from django.shortcuts import render, redirect

from blog.forms import SignUpForm 

def signup(request):

    if request.method == 'POST':

        form = SignUpForm(request.POST)

        if form.is_valid():

        form.is_staff = 1

        form.save()

            # username = form.cleaned_data.get('username')

            # raw_password = form.cleaned_data.get('password1')

            # user = authenticate(username=username, password=raw_password)

            # login(request, user)

            # return redirect('home')

    else:

        form = SignUpForm()

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

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