请大家给看看，个人觉得不好整

已知某班学生的姓名和成绩存在字典 lstudscore里，studscore={张三:45,"李四:78”徐来":40,"沙思思":96
"如一":65,"司音":90,"赵敏:78,“张旭宁:99,柏龙:60}，计算并打印出全班同学的平均分(小数点后保留两位)【样例输入】
【样例输出】72.33

studscore = {'张三': 45, '李四': 78, '徐来': 40, "沙思思": 96, "如一": 65, "司音": 90, '赵敏': 78, '张旭宁': 99, '柏龙': 60}

grade = 0
for i in studscore:
    grade = grade + studscore[i]
average = grade / len(studscore)
print("%.2f" % average)