Python GUI App with Tkinter
This guide demonstrates how to create a simple desktop Graphical User Interface (GUI) application using tkinter, Python's standard GUI library. We will build a basic "To-Do List" application.
Modules Used:
tkinter: The standard Python interface to the Tcl/Tk GUI toolkit.
Installation
tkinter is included with most Python installations. You can verify it by running:
python -m tkinterIf a small window appears, you are good to go. On Linux, you might need to install it manually (e.g., sudo apt-get install python3-tk).
The Code
Save this as todo_app.py.
import tkinter as tk
from tkinter import messagebox
class TodoApp:
def __init__(self, root):
self.root = root
self.root.title("Simple To-Do List")
self.root.geometry("400x450")
# 1. Entry Widget (Input)
self.task_entry = tk.Entry(root, width=30, font=("Arial", 14))
self.task_entry.pack(pady=20)
# 2. Add Button
self.add_button = tk.Button(root, text="Add Task", command=self.add_task, font=("Arial", 12))
self.add_button.pack(pady=5)
# 3. Listbox (Display)
self.tasks_listbox = tk.Listbox(root, width=40, height=10, font=("Arial", 12))
self.tasks_listbox.pack(pady=10, padx=10)
# 4. Delete Button
self.delete_button = tk.Button(root, text="Delete Selected", command=self.delete_task, font=("Arial", 12), bg="#ffcccc")
self.delete_button.pack(pady=5)
# Bind Enter key to add task
self.root.bind('<Return>', lambda event: self.add_task())
def add_task(self):
task = self.task_entry.get()
if task != "":
self.tasks_listbox.insert(tk.END, task)
self.task_entry.delete(0, tk.END)
else:
messagebox.showwarning("Warning", "You must enter a task.")
def delete_task(self):
try:
# Get index of currently selected item
selected_task_index = self.tasks_listbox.curselection()[0]
self.tasks_listbox.delete(selected_task_index)
except IndexError:
messagebox.showwarning("Warning", "You must select a task to delete.")
if __name__ == "__main__":
# Create the main window
root = tk.Tk()
# Initialize application
app = TodoApp(root)
# Start the event loop
root.mainloop()Usage
python todo_app.py- Type a task in the input box.
- Click "Add Task" or press Enter.
- Select a task and click "Delete Selected" to remove it.