how to use one function variable into another function?

Question

I have two function in Django Templates.

def cart(request, template="shop/cart.html"):
 cart_formset = CartItemFormSet(instance=request.cart)

def checkout_steps(request):

How I use the cart_formset variable in my checkout_steps function..

Answer 1

You can't. That's what local variables are: they're local to the function they're in. The variable cart_formset does not exist except when cart is executing.

You could return cart_formset from the function and then call cart from checkout_steps to get the value. Or you could store that variable somewhere else. I don't know enough about Django to know where the best place is. Given that what you're doing looks like a shopping cart setup, I would guess that you want to store that info with the session, so you could look at Django's session handling.

Answer 2

How I use the cart_formset variable in my checkout_steps function..

1. If the two functions are related, use a Class (like Shopping) and add cart and checkout_steps as member functions.

   class Shopping(object):
       def __init__(self):
           self.cart_formset = None
       def cart(self, request, template="shop/cart.html"):
           self.cart_formset = CartItemFormSet(instance=request.cart)
       def checkout_steps(self, request):
           #Use self.cart_formset
   

2. You can also put the variable cart_formset, as global to make it available globally across the module

   def cart(request, template="shop/cart.html"):
        global cart_formset
        cart_formset = CartItemFormSet(instance=request.cart)
   def checkout_steps(self, request):
        #Use self.cart_formset
   

3. If the order of function evaluation is deterministic then you can use a decorator