HackerRank: Python3 Agency List class and builder function.

agency-list.py

class AgencyList:
    def __init__(self):
        self.verticies = list()
        self.edges = dict()
    # dict of lists       
    def initEdge(self, v1, v2):
        if not v1 in self.edges:
            self.edges[v1] = list()
        if not v2 in self.edges:
            self.edges[v2] = list()
    # add verticies, 
    # make sure edge verticies are in
    # edges dict, add edges
    def addEdge(self, v1, v2):
        self.verticies.append(v1)
        self.verticies.append(v2)
        self.initEdge(v1, v2)
        self.edges[v1].append(v2)
        self.edges[v2].append(v1)
    # helper function
    def printEdges(self):
        print(self.edges)
    

def build_agency_list():  
    m, n  = input().split(' ')
    m = int(m)
    n = int(n)
    i=0
    # init AgencyList object
    al = AgencyList()
    # read input and build al
    while i < n:
        v1, v2 = input().split(' ')
        al.addEdge(int(v1), int(v2))
        i = i + 1  
    al.printEdges()

build_agency_list()