04计算学生成绩的分差和平均分

python = 95
english = 92
c = 89
sub = python - c
avg = (python + english + c) / 3
print("Python课程和C语言课程的分数之差:"+str(sub)+"分\n")
print("三门课程的平均分:"+str(avg)+"分")
print("学号：2020310143041")