Use variable from one function in another without return

[P13N]

I'm having those two functions in my code and want to be able to use the variable tdate from the function def todos_new(): in my second function def todos_print():.

def todos_new():
    tid = 139283983
    ttext = "text"
    tdate = "2018-12-12"
    new = tclass.ToDo(tid, ttext, tdate)
    todos.append(new)

def todos_print():
    datesearch = input('Search Date YYYY-MM-DD:')
    if datesearch < todos(tdate):#NameError: name 'tdate' is not defined
        print(todos)

Any idea how I can use that variable in my second function without return in my first function?
Thanks for your input!