#!/usr/bin/env python3

# pip3 install graph-tools

import random

import graph_tools

MAX_TIME = 100

def main():
    g = graph_tools.Graph(directed=False)
    g.add_edge(1, 2)
    g.add_edge(1, 3)
    g.add_edge(2, 3)
    g.add_edge(3, 4)
    g.add_edge(4, 5)
    #     2
    #   /   \
    # 1 ----- 3 ----- 4 ----- 5

    t = 0
    v = g.random_vertex()    
    while t <= MAX_TIME:
        print(t, v)
        neighbors = g.neighbors(v)
        v = random.choice(list(neighbors))
        t += 1

if __name__ == "__main__":
    main()