按名字

L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]

def by_name(t):

    return t[0]

L2 = sorted(L, key=by_name)

print(L2)

L = [('Bob', 75), ('Adam', 92), ('Bart', 66), ('Lisa', 88)]

def by_score(t):

    return t[1]

L2 = sorted(L, key=by_score,reverse=True)

print(L2)