Create contact-book-code.md

Author: saqib777

contact-book/contact-book-code.md

@@ -0,0 +1,142 @@
+
+Contact Book Application
+------------------------------------
+A simple command-line contact management app.
+It allows the user to:
+1. Add new contacts
+2. View all contacts
+3. Search for a contact
+4. Delete a contact
+
+All contacts are saved in a local file ('contacts.txt') for persistence.
+
+Concepts used:
+- File handling
+- Lists and dictionaries
+- Loops and conditionals
+- Input validation
+"""
+
+import os  # Used to check file existence and handle deletions
+
+# Utility Functions
+
+
+def load_contacts():
+    """Reads all contacts from 'contacts.txt' and returns them as a list of dictionaries."""
+    contacts = []
+    if os.path.exists("contacts.txt"):
+        with open("contacts.txt", "r") as file:
+            for line in file:
+                name, phone, email = line.strip().split("|")
+                contacts.append({"name": name, "phone": phone, "email": email})
+    return contacts
+
+
+def save_contacts(contacts):
+    """Saves all contacts to 'contacts.txt'."""
+    with open("contacts.txt", "w") as file:
+        for c in contacts:
+            file.write(f"{c['name']}|{c['phone']}|{c['email']}\n")
+
+
+
+# Core Functionality
+
+
+def add_contact(contacts):
+    """Adds a new contact to the list and saves it."""
+    name = input("Enter contact name: ").strip()
+    phone = input("Enter phone number: ").strip()
+    email = input("Enter email address: ").strip()
+
+    if not name or not phone:
+        print("Name and phone number are required!")
+        return
+
+    contacts.append({"name": name, "phone": phone, "email": email})
+    save_contacts(contacts)
+    print(f"Contact '{name}' added successfully.\n")
+
+
+def view_contacts(contacts):
+    """Displays all contacts."""
+    if not contacts:
+        print("No contacts found.\n")
+        return
+
+    print("\nYour Contacts:")
+    print("-" * 40)
+    for i, c in enumerate(contacts, start=1):
+        print(f"{i}. Name: {c['name']}")
+        print(f"   Phone: {c['phone']}")
+        print(f"   Email: {c['email']}\n")
+    print("-" * 40)
+
+
+def search_contact(contacts):
+    """Searches for a contact by name or phone number."""
+    keyword = input("Enter name or phone number to search: ").strip().lower()
+    results = [c for c in contacts if keyword in c["name"].lower() or keyword in c["phone"]]
+
+    if not results:
+        print("No matching contacts found.\n")
+        return
+
+    print("\nSearch Results:")
+    print("-" * 40)
+    for c in results:
+        print(f"Name: {c['name']}")
+        print(f"Phone: {c['phone']}")
+        print(f"Email: {c['email']}\n")
+    print("-" * 40)
+
+
+def delete_contact(contacts):
+    """Deletes a contact by name."""
+    name = input("Enter the name of the contact to delete: ").strip().lower()
+    for c in contacts:
+        if c["name"].lower() == name:
+            contacts.remove(c)
+            save_contacts(contacts)
+            print(f"Contact '{c['name']}' deleted successfully.\n")
+            return
+    print("Contact not found.\n")
+
+
+# Main Application Loop
+
+
+def main():
+    """Main menu loop."""
+    contacts = load_contacts()
+
+    while True:
+        print("""
+CONTACT BOOK =========
+1. View all contacts
+2. Add a new contact
+3. Search for a contact
+4. Delete a contact
+5. Exit
+)
+        choice = input("Enter your choice (1-5): ").strip()
+
+        if choice == "1":
+            view_contacts(contacts)
+        elif choice == "2":
+            add_contact(contacts)
+        elif choice == "3":
+            search_contact(contacts)
+        elif choice == "4":
+            delete_contact(contacts)
+        elif choice == "5":
+            print("Goodbye! Your contacts are saved.")
+            break
+        else:
+            print("Invalid choice. Please select between 1 and 5.\n")
+
+
+# Run the program
+if __name__ == "__main__":
+    main()