Program:16
Create a binary file with roll number, name and marks. Input a roll number and update the marks.
import pickle
import os
fh=open("student.dat","wb")
lst=[]
try:
while True:
r=int(input('enter roll no.: '))
n=input('enter name: ')
m=float(input('enter marks: '))
lst=[r,n,m]
pickle.dump(lst,fh)
ch=input('do you want to cont')
if ch=='Y' or ch=='y':
continue
else:
break
except EOFError:
fh.close()
fh=open("student.dat","rb")
t=open("temp.dat","wb")
r=int(input('enter the roll number to search'))
lst1=[]
z=0
try:
while True:
lst1=pickle.load(fh)
if lst1[0]==r:
lst1[2]=float(input('enter new marks: '))
pickle.dump(lst1,t)
z=1
else:
pickle.dump(lst1,t)
except EOFError:
if z==0:
print('record not found')
else:
print('marks updated successfully')
fh.close()
t.close()
os.remove("student.dat")
os.rename("temp.dat","student.dat")
fh=open("student.dat","rb")
lst1=[]
try:
while True:
lst1=pickle.load(fh)
print(lst1)
except EOFError:
fh.close()
Program:17
Write a random number generator that generates random numbers between 1 and 6 (smulates a dice).
#random number generator
import random
while True:
r=random.randint(1,6)
print (r)
ch=input('want to continue: ')
if ch=='Y' or ch=='y':
continue
else:
break
Program:18
Create a CSV file by entering user-id and password, read and search the password for given user- id.
import csv
f=open("details.csv","w",newline='')
w=csv.writer(f)
for i in range(3):
u=input('enter user ID: ')
p=input('enter password: ')
l=[u,p]
w.writerow(l)
f.close()
f=open("details.csv","r",newline='')
r=csv.reader(f)
u1=input('enter user id: ')
for i in r:
if i[0]==u1:
print(i[1])
