# Title: Project 1 - Friends
# Author: Rory Healy
# Date created - 16th April 2019
# Date modified - 18th April 2019

def get_friendly_dict(friend_list):
    '''Takes a list of reciprocal friendships links between individuals, 
    friend_list, and calculates the degree-one friends of each individual. 
    Returns a dictionary of sets containing all the immediate friends.'''
    
    # Creates a list of everyone.
    everyone_list = []
    for pairs in friend_list:
        for person in pairs:
            if person not in everyone_list:
                everyone_list.append(person)
                
    # Creates a dictionary using the people from everyone_list as keys, and 
    # assigns values as a set of immediate friends.
    current_friends = []
    friend_dict = {}
    for person in everyone_list:
        for pairs in friend_list:
            # Adds the other person in the pair to the list current_friends.
            if person in pairs:
                current_friends.append(pairs[pairs.index(person) - 1])
        friend_dict[person] = set(current_friends)
        current_friends = []
    
    return friend_dict