#
#	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("""
#   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="")

#   Each item in score_2 contains a dict with the name of the student as the key and the scores of three homework assignments as the value.
scores_2 = {
	"Joe": [96, 89, 97],
	"Jane": [88, 84, 83],
	"Jenny": [64, 57, 72]
}

print()  
for student in scores_2.keys():
    print(f"{student}'s scores: ", end="")
    for pos, score in enumerate(scores_2[student]):
        if pos == len(item)-1:
            print(score)
        else:
            print(f"{score}, ", end="")

scores_3 = {
	"Joe": {"HW1": 96, "HW2": 89, "HW3": 97, "HW4": 84},
	"Jane": {"HW1": 88, "HW2": 84, "HW3": 83},
	"Jenny": {"HW1": 64, "HW2": 57, "HW4": 72}
}

print()  
for student in scores_3.keys():
    print(f"current student: {student}")
    print(f"{student}'s scores: ", end="")
    print(f"scores_3[student]: {scores_3[student]}")
    print(f"scores_3[student.keys() {scores_3[student].keys()}")
   
    for pos, assignment_name in enumerate(scores_3[student].keys()):
        print(f"student/assignment: {student}/{assignment_name}")
        if pos == len(scores_3[student].keys())-1:
            print(f"{assignment_name}: {scores_3[student][assignment_name]}")
        else:
            print(f"{assignment_name}: {scores_3[student][assignment_name]}, ", end="")