#
#	Nested data structures.
#

#   Each item in score_1 contains the scores of three homework assignments.
scores_1 = [
	[96, 89, 97],
	[88, 84, 83],
	[64, 57, 72]
]

print(f"scores_1: {scores_1}")
print(f"scores_1[0]: {scores_1[0]}")
print(f"scores_1[2]: {scores_1[2]}")
print(f"scores_1[0:1]: {scores_1[0:1]}")
print(f"scores_1[:1]: {scores_1[:1]}")
print(f"scores_1[::-1]: {scores_1[::-1]}")

print(f"scores_1[2][1]: {scores_1[2][1]}")
print(f"scores_1[2][::-1]: {scores_1[2][::-1]}")
print(f"scores_1[2][1:3]: {scores_1[2][1:3]}")
print(f"scores_1[2][:2]: {scores_1[2][:2]}")
print(f"scores_1[0:2][1]: {scores_1[0:2][1]}")
print(f"scores_1[1:3]: {scores_1[1:3]}")
print(f"scores_1[1:3][1]: {scores_1[1:3][1]}")

print("""
#   Each item in score_1 is the score of three homework assignments.
scores_1 = [
	[96, 89, 97],
	[88, 84, 83],
	[64, 57, 72]
]
""")

#   print the individual scores of each student.
for item in scores_1:
    print(f"student score: ", end="")
    for score in item:
        print(score, end=" ")
    print()

print()    
#   putting a comma between scores.
for item in scores_1:
    print(f"student scores: ", end="")
    for pos, score in enumerate(item):
        if pos == len(item)-1:
            print(score)
        else:
            print(f"{score}, ", end="")

print()             
#   Second version using list comprehensions.
for item in scores_1:
    print(f"student scores: ", end="")
    str_item = [str(score) for score in item]
    print(", ".join(str_item))
    
print()    
#   add student #
for student_num, item in enumerate(scores_1):
    print(f"student #{student_num + 1} scores: ", end="")
    for pos, score in enumerate(item):
        if pos == len(item)-1:
            print(score)
        else:
            print(f"{score}, ", end="")