urls.py

from django.urls import path

from views import sum_odd_numbers

urlpatterns = [
    path("sum_odd_numbers/<int:n>", sum_odd_numbers),
]

views.py

from django.http import HttpResponse
from django.http.request import HttpRequest

def sum_odd_numbers(request: HttpRequest, n: int) -> HttpResponse:
    """Sum all the odd numbers less than n"""

    v = 0

    for i in range(n):
        if i % 2 == 1:
            v += i

    return HttpResponse(v)