GUI Programming with Tkinter

Building desktop windows, labels, buttons, entry fields, and event loops.

Introduction to Tkinter

Tkinter is Python's built-in GUI library. It is included with Python — no pip install needed.

Your First Window

import tkinter as tk

root = tk.Tk()
root.title("My First GUI")
root.geometry("400x200")

label = tk.Label(root, text="Hello, Tkinter!", font=("Arial", 16))
label.pack(pady=20)

btn = tk.Button(root, text="Click Me",
                command=lambda: label.config(text="Button clicked!"))
btn.pack()

root.mainloop()

Entry Widget and Event Handler

def greet():
    name = entry.get()
    result_label.config(text=f"Hello, {name}!")

root = tk.Tk()
root.title("Greeter")

tk.Label(root, text="Your name:").pack(pady=5)
entry = tk.Entry(root, width=25)
entry.pack(pady=5)
tk.Button(root, text="Greet", command=greet).pack(pady=5)
result_label = tk.Label(root, text="", font=("Arial", 14))
result_label.pack(pady=10)
root.mainloop()

Layout Managers

• .pack() — simple top-down stacking.
• .grid(row, column) — table-based positioning.
• .place(x, y) — absolute pixel coordinates.