import pickle
def enter():
f1=open("c:\\xics\\data.dat","wb")
n=int(input("Enter ni of students."))
for i in range(n):
rno=int(input("Enter roll no."))
name=input("Enter name")
marks=int(input("enter marks"))
d={"rno":rno,"name":name,"marks":marks}
pickle.dump(d,f1)
f1.close()