list1 = ["國文", "數學", "自然"]
list2 = [["a", "國文", 100],
["a", "數學", 20],
["a", "自然", 40],
["b", "國文", 30],
["b", "數學", 100],
["c", "自然", 60]
]
students = sorted(list(set(i[0] for i in list2))) # students list
# 3.9+ ONLY
# d = {j: i for i, j in enumerate(list1, 1)} | {
# j: i for i, j in enumerate(students)}
d1 = {j: i for i, j in enumerate(list1, 1)} # course index
d2 = {j: i for i, j in enumerate(students)} # student index
d = {**d1, **d2}
# {'國文': 1, '數學': 2, '自然': 3, 'a': 0, 'b': 1, 'c': 2}
res = [[s] + [None]*len(list1) for s in students] # init list
for student, course, score in list2:
res[d[student]][d[course]] = score
print(res)
