Build a random number generator GUI

Here’s a complete Python example of a simple random number generator GUI using Tkinter. It generates a random integer within a user-specified range when you press the button.

python
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import tkinter as tk
from tkinter import messagebox
import random

def generate_random_number():
    try:
        start = int(entry_start.get())
        end = int(entry_end.get())
        if start > end:
            messagebox.showerror("Input Error", "Start value must be less than or equal to End value.")
            return
        rand_num = random.randint(start, end)
        label_result.config(text=f"Random Number: {rand_num}")
    except ValueError:
        messagebox.showerror("Input Error", "Please enter valid integers.")

# Create main window
root = tk.Tk()
root.title("Random Number Generator")
root.geometry("300x200")

# Widgets
tk.Label(root, text="Start:").pack(pady=5)
entry_start = tk.Entry(root)
entry_start.pack()

tk.Label(root, text="End:").pack(pady=5)
entry_end = tk.Entry(root)
entry_end.pack()

btn_generate = tk.Button(root, text="Generate", command=generate_random_number)
btn_generate.pack(pady=10)

label_result = tk.Label(root, text="Random Number: ")
label_result.pack(pady=10)

root.mainloop()

How it works:

• Enter start and end numbers in the two input fields.

• Click “Generate” to display a random integer between those numbers.

• Input validation handles incorrect or reversed ranges with popup errors.

Let me know if you want a version with more features or a different style!