How to Create Telephone Directory in Python

Python is a general purpose, high level programming language used for multiple purposes such as Data Science, Machine Learning, Robotics, Web applications, Desktop applications etc. Here, I have explained how to create a telephone directory in Python.

Telephone Directory is a Python application that keeps names and email addresses in a dictionary as key-value pairs. The program should display a menu that lets the 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. The program should pickle the dictionary and save it to a file when the user exits the program. Each time the program starts, it should retrieve the dictionary from the file and unpickle it.

import pickle
 try:
  contact=pickle.load(open("save.p", "rb+"))
 except IOError:
  contact={}
  pass
 def pick():
  pickle.dump(contact, open("save.p", "wb"))
 def store():
  global contact
  name=input("Enter name:")
  phone=input("Enter Phone:")
  if name in contact:
  print("Contact Already exists !\n")
  else:
  contact[name] =phone
  print("Contact Stored !")
  print(contact)
  print("Do you want to perform more operations? (y / n)")
  choice = input().strip()
  if choice == "y":
  main()
  pick()
 def search():
  global contact
  print("Enter the name to be searched")
  iname = input().strip()
  if iname in contact:
  print (contact[iname])
  else:
  print("Contact not found !\n")
  print("Do you want to perform more operations? (y / n)")
  choice = input().strip()
  if choice == "y":
  main()
 def update():
  global contact
  print("Enter the contact name to be updated -")
  name = input().strip()
  if name in contact:
  print("Enter the phone number-")
  phone = input()
  contact[name]=phone
  print("Contact updated\n")
  print(contact)
 
  else:
  print("Contact not found !\n")
  print("Do you want to perform more operations? (y / n)")
  choice = input().strip()
  if choice == "y":
  main()
  pick()
 def delete():
  global contact
  print("Enter the contact name to be deleted")
  name = input().strip()
  if name in contact:
  del(contact[name])
  print("Contact Deleted !\n")
  else:
  print("Contact not found !\n")
  print("Do you want to perform more operations? (y / n)")
  choice = input().strip()
  if choice == "y":
  main()
  pick()
 def main():
  print("lookup (1)")
  print("add (2)")
  print("change (3)")
  print("Delete (4)")
 
  choice = int(input())
  if choice==1:
  search()
  elif choice==2:
  store()
  elif choice==3:
  update()
  elif choice==4:
  delete()
 
 main()