How do I send a variable from one function to another function?

Question

Here is an example of a function that I want to be able to pass one variable to the other.

def foo(request):
    if request.method == "POST":
        unique_id = request.POST.get('per_id','')
        baz = get_object_or_404(Name, pk=unique_id)
        return render(request, 'details/guy.html', {'baz': baz})
    return render(request, 'details/person.html')

def bar(request):
    if request.method == "POST":
        baz = get_object_or_404(Name, pk=unique_id)
        return render(request, 'details/guy.html', {'baz': baz})
    return render(request, 'details/guy.html')

The problem is this:

local variable 'unique_id' referenced before assignment

So, how do I get this variable to feed from the foo(request) function to the bar(request) function?

I know I can use cPickle, but the amount of traffic this website will be getting will almost certainly cause the cPickle object to be mixed up with another person.

Answer 1

Session Variable should be used sparsely.

def foo(request):
    if request.method == "POST":
        unique_id = request.POST.get('per_id','')
        request.session["unique_id"] = unique_id
        baz = get_object_or_404(Name, pk=unique_id)
        return render(request, 'details/guy.html', {'baz': baz})
    return render(request, 'details/person.html')

def bar(request):
    if request.method == "POST":
        baz = get_object_or_404(Name, pk=request.session["unique_id"])
        del request.session["unique_id"]
        return render(request, 'details/guy.html', {'baz': baz})
    return render(request, 'details/guy.html')

I would not recommend but one can use global variable too.

unique_id = None

def foo(request):
    global unique_id
    unique_id = 10

def bar(request):
    print unique_id