class phonebook():
    def __init__(self):
        self.phonedic = {}              #creates an empty dictionary
        self.alias = {}

    def add(self, name, number):        #this function adds a contact
        d = self.phonedic
        for key, value in d.items():
            if  number in value:
                print "That number already exist in the phonebook"
                return
        self.phonedic[name] = number
        self.alias[name] = name
        print name , "has been added."
    def lookup(self, name):         #this function can look up a contact
        print "self.phonedic.has_key = " , self.phonedic[name]
        print "self.alias.has_key= ", self.alias[name]

        if self.phonedic.has_key(name):
            print name + ":s" , "number:" , self.phonedic[name]
        elif self.alias.has_key(name):
            print name + ":s" , "number:" , self.alias[name]
        else:
            print name , "does not exist."

    def alias1(self, name, nickname): #creates an alias for the contact, so it can be found under both names
        print "namn" , name , "nickname:", nickname
        if self.phonedic.has_key(name):
            self.alias[nickname] = name
            print "alias tillagd"
            print self.alias
        else:
            print "Can't create an alias for a non-existent contact."

    def change(self, name, number): #changes the number of a contact
        if self.phonedic.has_key(name):
            self.phonedic[name] = number
            print "The new number is saved."
        else:
            print "Couldnt find the contact", name

    def save(self, filename):       #saves the phonebook to a file
        f = open("C://Python27//Labbar//" + filename, "w")
        for key, value in self.phonedic.items():
            k = value + ";" + key + ";" + "\n"
            f.write(str(k))
        f.close()
        print "File saved with the name: " , filename
    def load(self, filename):
        f = open("C://Python27//Labbar//" + filename, "r")
        for line in f:
            x = line.split(";")
            x[-1] = x[-1].strip("\n")
            number = x[0]
            name = x[1]
            self.phonedic[name] = number
        f.close()
def main():
    pb = phonebook()
    while True:
        prompt = raw_input("Phonebook>>")
        x = prompt.split()
        try:
            function = x[0]

            if function == "add":
                pb.add(x[1],x[2])
            elif function == "lookup":
                pb.lookup(x[1])
            elif function == "save":
                pb.save(x[1])
            elif function == "alias1":
                pb.alias1(x[1],x[2])
            elif function == "change":
                pb.change(x[1],x[2])
            elif function == "quit":
                break
            elif function == "load":
                pb.load(x[1])
            else:
                print "Non-existent function, try again."
        except: IndexError

main()