Access from one class to methode of other class

[VK]

Hi, all!

In my programm i have to insert a variable from class 2 to class 1 and I 
get error NameError: global name 'd' is not defined. How do I get access 
to d.entry.insert() method of class 1

class 1:
    self.entry = Entry(self.entryframe)
    self.entry.pack()

    self.button = Button(command = self.callclass2window)

    def callclass2window
	c = 2()


class 2:
    def ins(self)
	d.entry.insert(variable)


d = 1()