请将下述程序补充完整，计算并输出Peter各科平均分。 提示：使用**参数以字典形式吸收关键字参数。 程序期望的执行结果为： math : 90 english : 88 python : 95 sports : 76 Peter's average score is:87.25 def key(sName= Peter ,____1_____): sum=0 for i,j in course.items(): print(i, : ,j) for i in ____2_____: sum=sum+i avg=sum/_____3___ print( {}'s average score is:{:.2f} .format(sName,avg)) key(math=90,english=88,python=95,sports=76)

def key(sName="Peter", **course):
    sum = 0
    for i, j in course.items():
        print(i, ":", j)
    for i in course.values():
        sum += i
    avg = sum / len(course)
    print("{}'s average score is:{:.2f}".format(sName, avg))

key(math=90, english=88, python=95, sports=76)