graph = {0:[1,4,5], 1:[3,4], 2:[1], 3:[2,4], 4:[], 5:[]}

visited = []
def dfs(node):
    visited.append(node)
    print('Node %i' % node)
    for i in graph[node]:
        if i not in visited:
            dfs(i)

if __name__ == '__main__':
    dfs(0)