def add_city(self):
'''
Adds a city (node) to the graph
'''
code = raw_input("What is the metro's code? ")
name = raw_input("What is the metro's name? ")
country = raw_input("Where country is the metro in? ")
continent = raw_input("What continent is the metro in? ")
timezone = raw_input("What timezone is the metro in? ")
coordOneDir = raw_input("What is the first heading of the coordinate? ")
coordOneVal = raw_input("What is the degree of the first heading? ")
coordTwoDir = raw_input("What is the second heading of the coordinate? ")
coordTwoVal = raw_input("What is the degree of the second heading? ")
coordinates = {coordOneDir: coordOneVal, coordTwoDir: coordTwoVal}
population = raw_input("What is the population of the metro? ")
region = raw_input("What is the region of the metro? ")
city = Metro(code, name, country, continent, timezone, coordinates, population, region, {})
self.list_of_metros[city.name] = city
city.printInformation()
