在Django views.py中创建变量，并在以后访问它们

Question

Let's say I have the following two functions in views.py:

def foo(request):
    class_instance = SomeClass()
    return HttpResponse('whatever')

def bar(request):
    # here I want to access class_instance

Initially, foo() is called, and at a later point bar() is called, in which I want to access the variable class_instance .

Is there any way of accomplishing this while neither using request.session nor Django models (eg django.db.models )?

(NB: I had some luck with global variables in views.py, but this is probably a bad idea anyway and somehow didn't always work)

Answer 1

You can put your variable as a module constant, especially if it's not prone to changing much.

CLASS_INSTANCE = SomeClass()

def foo(request):
    return HttpResponse('whatever')

def bar(request):
    # here I want to access CLASS_INSTANCE

Then both methods will have access to that, but keep in mind, that functions can't change constant's value this way .

PS: Actually you can change the value of the global:

CLASS_INSTANCE = SomeClass()

def foo(request):
    global CLASS_INSTANCE
    CLASS_INSTANCE = SomeClass() # new instance
    return HttpResponse('whatever')

def bar(request):
    # here I want to access CLASS_INSTANCE