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()