class student():
def_init_(self,name="姓名",number="学号”,major="无"):
self.user name=name
self.user_number=number 
self.user major=major

def print_info(self):
print("姓名:%s，学号:%s,专业:%s"%(sclf.user_name,self.user_number,self.user_major))

zhangsan=student("张三","123456","计科") 
lisi=student("李四","123789","软工")
xiaoming=student("小明","456789","数媒") 
zhangsan.print_info() 
lisi.print_info()
xiaoming.print_info()