length=5

def flip(N, bit):
    pattern = 3 if bit == 0 else 7 << bit-1
    return (N ^ pattern) & ((1 << length)-1)

def binary(n):
    return format(n, '0%ib' % length)[::-1]

from graphviz import Graph
dot = Graph()

for v1 in range(2**length):
    for b in range(length):
        v2 = flip(v1, b)
        if v1 <= v2:
            dot.edge(binary(v1),binary(v2),str(b+1)+".")
dot.render('graph_complete%i' % length, view=True)