# scores-list.py
# David Kauchak
#
# A set of functions for reading in scores and calTrculating
# various statistics from the input scores.

def get_scores():
    """
    Read user input of numerical scores as floats into a list
    and return the list
    """
    print("Enter the scores one at a time.  Blank score finishes.")
    
    scores = []
    line = input("Enter score: ")
    
    while line != "":
        scores.append(float(line))
        line = input("Enter score: ")
    
    return scores
        
def inelegant_average(scores):
    """ Calculate the average of the values in list scores """
    sum = 0.0
    count = 0
    
    for score in scores:
        sum += score
        count += 1
    
    return sum/count

def average(scores):
    """ Calculate the average of the values in list scores """
    return sum(scores)/len(scores)

def median(scores):
    """ Calculate the median of the values in list scores """    
    scores.sort()
    midpoint = int(len(scores)/2)
    
    if len(scores) % 2 == 0:
        return (scores[midpoint-1] + scores[midpoint])/2
    else:
        return scores[midpoint]

def assign_grades(scores):
    """
    Given a list of scores (numbers) calculate a letter grade
    for each score.  If the score is greater than the average
    then it receives and A.  If it is less than, an F.  The function
    returns a list of grades where index i in the list corresponds
    to the score i in the input lis=t
    """
    avg = average(scores)
    grades = []
    
    for score in scores:
        if score >= avg:
            # gets an A
            grades.append("A")
        else:
            grades.append("F")
    
    return grades

def print_class_stats(scores):
    """ Print out various stats about the list of scores """
    print("Class max: " + str(max(scores)))
    print("Class min: " + str(min(scores)))
    print("Class average: " + str(average(scores)))
    print("Class median: " + str(median(scores)))
    print("Class grades:")
    
    grades = assign_grades(scores)
    
    for i in range(len(grades)):
        print(str(scores[i]) + " -> " + grades[i])
    
# get the scores from the user and then print out the stats
scores = get_scores()
print("-"*10)
print_class_stats(scores)