# Program to add scores in a file, prettyprint the lines, and
# compute and print the average
# Name of file is "scores.txt" in current working directory
# Format of file: each line has a name, a blank, and an integer score; example:
# Tom 30
# Dick 100
# ...
# Matt Bishop, Apr. 27, 2009
# for ECS 10 Spring 2009

import string;

# this routine splits a line into the name and the score
# parameters: line, the input line
# returns: the score
# side effect: prints the input line in a nice way
def format(line):
    # separate the line into two parts at the blank
    fields = string.split(line, " ");
    # convert the second field to an int (it's a string from the above line)
    fields[1] = int(fields[1]);
    # prettyprint the line, so the names line up, and the scores line up
    print "%-13s %4d" % ( fields[0] , fields[1] );
    # return the score
    return fields[1];
 
# this routine manages the score file and builds a list of scores
# returns: a list of scores as integers
# calls: format: parse line, prettyprint it, and return score from it
def readscores():
    # open the file containing scores
    scoref = open("scores.txt", "r");
    # initialize the list of scores
    scores = [];
    # read and process each line
    for line in scoref:
        # get the score (and prettyprint the line)
        grade = format(line);
        # add score to list
        scores = scores + [ grade ];
    # close the file containing scores
    scoref.close();
    return scores;

# this routine computes the average of a list of integers
# returns: the average of the numbers in the list
def average(scores):
    # initialize the sum
    sum = 0;
    # add the numbers in the list
    for i in scores:
        sum += i;
    # compute the average
    return sum / len(scores);

# now put it all together
# calls: readscores: prints lines and returns list of scores found
#        average: compute average of a list of numbers
def main():
    # read in the scores, and prettyprint the lines
    listscores = readscores();
    # print the average
    print "Average score: %3d" % average(listscores);

main();