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()
