simple Tkinter contact book.

contact_book.py

from tkinter import *
from tkinter import messagebox

root = Tk()
root.geometry("480x170")
root.title("Raha Contacts books")

Name = StringVar()
Number = StringVar()
Address = StringVar()
SearchTerm = StringVar()

def getAllContacts():
    with open("contacts.txt", "r") as f:
        rows = f.readlines()
        return [row.replace("\n", "").split(" : ") for row in rows]

def drawTable(window, contacts):
    data = [["Name", "Phone", "Address"]]
    data.extend(contacts)
    total_rows = len(data)
    total_columns = len(data[0])
    for i in range(total_rows):
        for j in range(total_columns):
            e = Entry(window, width=15, font="arial 12")
            e.grid(row=i, column=j)
            e.insert(END, data[i][j])

def insertData():
    name, phone, address = Name.get(), Number.get(), Address.get()
    if name == "": messagebox.showwarning("Nothing to insert!", "Please specify a name to insert!")
    else:
        if phone == "": phone += " "
        if address == "": address += " "
        with open("contacts.txt", "a") as f:
            f.write(name + " : " + phone + " : " + address + "\n")
        messagebox.showinfo("Contact inserted", "Contact " + name + " inserted successfully!")

def searchData():
    search_term = SearchTerm.get().strip().lower()
    if search_term == "":
        messagebox.showwarning("Nothing to search", "Please enter some data to search for!")
    else:
        listWindow([row for row in getAllContacts() if search_term in row[0].lower()])

def insertWindow():
    newWindow = Toplevel(root)
    newWindow.title("Insert new contact")
    newWindow.geometry("400x250")

    frame = Frame(newWindow)
    frame.pack(pady=10)

    frame1 = Frame(newWindow)
    frame1.pack(pady=10)

    frame2 = Frame(newWindow)
    frame2.pack(pady=10)

    frame3 = Frame(newWindow)
    frame3.pack(pady=10)

    Label(frame, text="Name: ", font="arial 12 bold").pack(side=LEFT)
    Entry(frame, textvariable=Name, width=50).pack()

    Label(frame1, text="Phone: ", font="arial 12 bold").pack(side=LEFT)
    Entry(frame1, textvariable=Number, width=50).pack()

    Label(frame2, text="Address: ", font="arial 12 bold").pack(side=LEFT)
    Entry(frame2, textvariable=Address, width=50).pack()

    Button(frame3, text="Submit", font="arial 12", command=insertData).pack(side=LEFT)
    Button(frame3, text="Cancel", font="arial 12", command=newWindow.destroy).pack(
        padx=10
    )

def listWindow(contacts=None):
    newWindow = Toplevel(root)
    newWindow.title("List Window")
    newWindow.geometry("550x300")

    frame = Frame(newWindow)
    frame.pack(pady=10)
    if contacts is None:
        print(">>>", getAllContacts())
        drawTable(frame, getAllContacts())
    else:
        print(">>>", contacts)
        drawTable(frame, contacts)

def searchWindow():
    newWindow = Toplevel(root)
    newWindow.title("New Window")
    newWindow.geometry("400x120")

    frame = Frame(newWindow)
    frame.pack(pady=10)

    frame_1 = Frame(newWindow)
    frame_1.pack(pady=10)

    Label(frame, text="Search term: ", font="arial 12 bold").pack(side=LEFT)
    Entry(frame, textvariable=SearchTerm, width=50).pack()

    Button(frame_1, text="Search", font="arial 12", command=searchData).pack(side=LEFT)

label = Label(root, text="Select your option")
label.pack(pady=10)

Button(root, text="Insert", font="arial 12", command=insertWindow).place(
    x=50, y=50, width=100
)
Button(root, text="List", font="arial 12", command=listWindow).place(
    x=175, y=50, width=100
)
Button(root, text="Search", font="arial 12", command=searchWindow).place(
    x=300, y=50, width=100
)

Button(root, text="Exit", font="arial 12", command=root.destroy).place(
    x=125, y=100, width=200
)

root.mainloop()