Question

In views.py

When I try this one to access a global variable from other def:

def start(request):
    global num
    num=5
    return HttpResponse("num= %d" %num) # returns 5 no problem....

def other(request):
    num=num+1
    return HttpResponse("num= %d" %num)

def other does not return 6, but it should be 6 right ? How can I access a variable globally in my view ?

Answer 1

Use sessions. This is exactly what they are designed for.

def foo(request):
   num = request.session.get('num')
   if num is None:
      num = 1
   request.session['num'] = num
   return render(request,'foo.html')

def anotherfoo(request):
   num = request.session.get('num')
   # and so on, and so on

If the session has expired, or num did not exist in the session (was not set) then request.session.get('num') will return None. If you want to give num a default value, then you can do this request.session.get('num',5) – now if num wasn’t set in the session, it will default to 5. Of course when you do that, you don’t need the if num is None check.