from operator import itemgetter

# All HWs out of 10 pts
grades = { "Cynthia": {"HW1":7, "HW2":6, "HW3":8},
           "Ruth": {"HW1":8, "HW2":9, "HW3":0, "HW4":7},
           "Eric": {"HW1":10, "HW2":8, "HW3":5},
           "Emilia": {"HW1":9, "HW2":8, "HW3":9},
            "Emily": {"HW1":10, "HW2":8, "HW3":8},
           "Lauren": {"HW1":9, "HW2":9, "HW3":9}}

# Create a list of (Name, Avg) tuples where Avg is HW Average

name_avg_list = []

for name in grades.keys():
    score_dict = grades[name]
    sum_of_scores = 0
    count_of_scores = 0
    for hw in score_dict:
        score = score_dict[hw]
        sum_of_scores += score
        count_of_scores += 1
    average_score = float(sum_of_scores)/count_of_scores
    name_avg_list.append((name, average_score))
print name_avg_list

print sorted(name_avg_list, key=itemgetter(1), reverse=True)

# Planning the code:
#
# for each name, get score_dict    
#  process each score_dict by:
#   sum up all hw scores
#   count how many hw scores
#  calc avg as sum/count
#  create a tuple: (name, avg)
#  append tuple to list of tuples