import pickle
def Write():
f = open("Studentdetails.dat", 'wb')
while True:
r =int(input ("Enter Roll no : "))
n = input("Enter Name : ")
m = int(input ("Enter Marks : "))
record = [r,n,m]
pickle.dump(record,f)
ch = input("Do you want to enter more ?(Y/N)")
if ch in 'Nn':
break
f.close()
def Read():
f = open("Studentdetails.dat",'rb')
try:
while True:
rec=pickle.load(f)
print(rec)
except EOFError:
f.close()
def Update():
f = open("Studentdetails.dat", 'rb+')
rollno = int(input("Enter roll no whoes marks you want to update"))
try:
while True:
pos=f.tell()
rec = pickle.load(f)
if rec[0]==rollno:
um = int(input("Enter Update Marks:"))
rec[2]=um
f.seek(pos)
pickle.dump(rec,f)
#print(rec)
except EOFError:
f.close()
Write()
Read()
Update()
Read()