Python

Here are some basic Python codes to generate a simple app:

1. Hello World App:
```
import tkinter as tk
root = tk.Tk()
label = tk.Label(root, text="Hello World!")
label.pack()
root.mainloop()
```
1. To-Do List App:
```
import tkinter as tk
from tkinter import messagebox

def add_task():
tasks.append(entry.get())
entry.delete(0, tk.END)
listbox.insert(tk.END, tasks[-1])

def delete_task():
try:
task_index = listbox.curselection()[0]
listbox.delete(task_index)
tasks.pop(task_index)
except:
pass

root = tk.Tk()
entry = tk.Entry(root)
entry.pack()
button_add = tk.Button(root, text="Add task", command=add_task)
button_add.pack()
listbox = tk.Listbox(root)
listbox.pack()
button_delete = tk.Button(root, text="Delete task", command=delete_task)
button_delete.pack()
tasks = []
root.mainloop()
```
1. Simple Calculator App:
```
import tkinter as tk

def calculate():
try:
result = eval(entry.get())
label.config(text = "Result: " + str(result))
except:
label.config(text = "Invalid

I am student of Mechanical engineering technology. In PTUT lahore