Question

I have class which holds a an integer and another list holds the data.

class Vertex:
    def __init__(self, ID = str()):
        self.id = ID
        self.neighbors = AdjacencyList()

Adjacency list is another class. which holds a list.

I would to print the id and the list in the neighbors with a single print statement. How it’s possible?

This is the code I use right now (employing string concatenation)

def printGraph(g = Graph()):
    msg = str('')
    for k, v in g.nodes.iteritems():
        root_node = g.nodes[k]
        msg = "(" + k + " , " + str(root_node.color) + ") : "

        for x in v.neighbors.innerlist:
            msg += str(x.id) + " , "
        print msg

You can see the whole string separators I used in the print method.

Answer 1

You can use str.format() function to format your output: –

print "Id: {0}, Neighbour: {1}".format(self.id, self.neighbours)

This will work in Python 2.6+. For older version, you might need to use the one in the @Daniel’s answer.

From Python 2.7, you can also omit that positional argument and just use {}: –

print "Id: {}, Neighbour: {}".format(self.id, self.neighbours)