class Find:

    def setdata(self, name, childs):

        self.childs = childs

        self.name = name

A = Find()

B = Find()

C = Find()

D = Find()

E = Find()

F = Find()

E.setdata('E', [A, D])

D.setdata('D', [F])

A.setdata('A', [B, C])

F.setdata('F', [])

C.setdata('C', [])

B.setdata('B',[])

def Dep(a):

    print(a.name)

    if a.childs == False:

        return

    for i in a.childs:

        Dep(i)

Dep(E)