Validate Software Registration Key – Python Tkinter GUI Tutorial 190

In this video I’ll show you how to validate your generated registration key with Tkinter and Python.

In the last video we generated a random serial number for software registration. In this video I’ll show you how to validate that key, and also generate a key that is always valid.

What makes a valid key? A valid key is valid if we say it is! Whatever rule we create to validate a key will work, so long as that rule is met.

In this video we’ll make sure a certain digit occurs three times in our key, and also we’ll make sure our key has a numerical score between 1700 and 1800.

Python Code: register.py
(Github Code)

from tkinter import *
import random

root = Tk()
root.title('Codemy.com - Software Registration Key Generator')
root.iconbitmap('c:/gui/codemy.ico')
root.geometry("500x500")

# Verify the key
def verify(key):
	global score
	score = 0

	# Definie Our Check Digit 
	check_digit = key[2]
	check_digit_count = 0

	#aafa-bbfb-cccc-ddfd-1111
	# Separate By Dash
	chunks = key.split('-')

	# Loops thru and check stuff
	for chunk in chunks:
		if len(chunk) != 4:
			return False

		for char in chunk:
			if char == check_digit:
				check_digit_count += 1
			# Grab the score of the ANSCII character
			score += ord(char)

	# Check for rules
	if score > 1700 and score < 1800 and check_digit_count == 3:
		return True
	else:
		return False


# Generate Key
def generate():
	# Clear key label
	key_label.delete(0, END)
	verify_label.config(text="")

	# Set some defaults
	key = ''
	section = ''
	check_digit_count = 0
	alphabet = 'abcdefghijklmnopqrstuvwxyz1234567890'

	# key = aaaa-bbbb-cccc-dddd-1111 or 24 characters

	while len(key) < 25:
		# Randomly pick digit from alphabet
		char = random.choice(alphabet)
		# Add random choice to key
		key += char
		# Also add the random choice to the section blob
		section += char

		# Add in the dashes/hyphens
		if len(section) == 4:
			# add in a hyphen
			key += '-'
			# Reset the section to nothing
			section = ''
	# set key to all but the last digit
	key = key[:-1]

	# output the key
	#key_label.insert(0, key)

	# Vefrify
	if verify(key):
		key_label.insert(0, key)
		verify_label.config(text="Valid!!")
		score_label.config(text=f'Score: {score}')
	else:
		# key is not verified
		# Run the generate function again
		generate()

# Create a button
generate_button = Button(root, text="Generate Key!", font=("Helvetica", 32), command=generate)
generate_button.pack(pady=50)

# Key Label
key_label = Entry(root, font=("Helvetica", 24), bd=0, bg="systembuttonface", width=25)
key_label.pack(pady=10, padx=50)

# Verify Label
verify_label = Label(root, text="Waiting...", font=("Helvetica", 32))
verify_label.pack(pady=10)

# Score Label
score_label = Label(root, text="Score: ", font=("Helvetica", 32))
score_label.pack(pady=10)




root.mainloop()