simple_course_grading_short_code

#!/usr/bin/env python
marks = [75, 45, 89, 55, 65, 50, 72, 70, 60, 80, 95, 34, 83, 71, 65, 53, 58, 79, 85, 21, 67, 94, 77]

def grade_single_score(score_mark):
    grades = [['U', 0,  49], ['D',  50, 59], ['C',  60, 69], ['B',  70, 79], ['A',  80, 89], ['A*', 90, 100]]
    for grade in grades:
        if grade[1] <= score_mark <= grade[2]:
            return grade[0]
    return 'N/A'

def grade_and_print_scores(score_list):
    for idx, score in enumerate(score_list): print("Mark [%d] - %d - %s" % (idx, score, grade_single_score(score)))

def print_grade_distribution(score_list, grades_distr = {}):
    for score in score_list:
    grade = grade_single_score(score)
    grades_distr[grade] = 1 if not grades_distr.has_key(grade) else grades_distr[grade] + 1
    for grade, frequency in sorted(grades_distr.items(), lambda lhs, rhs: -1 if lhs[0].endswith('*') else cmp(lhs, rhs)):
    print("Grade %s - %i" % (grade, frequency))

grade_and_print_scores(marks)
print("--------------------")
print_grade_distribution(marks)