Write a program that keeps names and emails addresses in a dictionary as key-value pairs. First print all keys with their value using for loop. then the program should display a menu that lets user look up a person’s email address, add a new name and email address, change an existing email address and delete an existing name and email address

Explanation:

f=open('email.dat','rb')

   d=pickle.load(f)

   f.close()

except:  

   d={}

while True:

   print('\n1. Find a email address')

   print('2. Add name and email address')

   print('3. Change an email address')

   print('4. Delete an email address')

   print('5. Exit\n')

   choice=input('\nEnter a choice: ')

   if choice:

       choice=int(choice)

   else:

       print('\nEnter a number')

       continue  

   if choice == 1:

       while True:

           name=input('\nEnter the name ')

           if name:

               if name in d:

                   print('\n%s is the email id of %s \n' % (d[name],name))

                   break

               else:

                   print('\n Email not found \n')

                   break

           else:

               print('\nName cannot be empty\n')

               continue

   elif choice==2:

       while True:          

           name=input('\nEnter the name ')

           if name:

               break;

           else:

               print('\nName cannot be empty \n')

               continue

       while True:          

           email=input('\nEnter the email address ')

           if email:

               d[name]=email

               break

           else:

               print('\nEmail cannot be empty\n')

               continue

         elif choice==3:

       while True:          

           name=input('\nEnter the name to change the email address ')

           if name:

               if name in d:

                   email=input('\nEnter the new email address ')

                   d[name]=email

                   print('\nEmail address changed \n')

                   break;

               else:

                   print('\nName not found \n')

                   break

           else:

               print('\nName cannot be empty \n')

               continue

   elif choice == 4:

       while True:          

           name=input('\nEnter the name to remove ')

           if name:

               if name in d:

                   del d[name]

                   print('\nName and Email address removed \n ')

                   break;

               else:

                   print('\nName not found \n')

                   break

           else:

               print('\nName cannot be empty\n')

               continue

   elif choice == 5:

       f=open('email.dat','wb')

       pickle.dump(d,f)

       f.close()

       sys.exit()

   else:

       print('\nEnter a valid choice ')

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