Python

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console applications
#	console 1	console 2	console 3	console adv
	input output	iteration while	string manipulation	object oriented programming theory
	data types	iteration for	dictionaries	class, instance and method
	random numbers	recreate challenge iii	sets	constructor and instance variable
	branching if	recreate challenge iv	tuples	class variables
	branching if else	iteration nested	exercises E	inheritance
	recreate challenge i	exercises B	exercises F	polymorphic override and private
	branching and or not	exercises C	functions
	recreate challenge ii	lists	recursion
	nested & branching elif	recreate challenge v	importing separate files
	exercises A	exercises D	files R/W
	mc test i answer sheet	mc test ii answer sheet	exceptions

GUI packages
#	PyQt6	PySimpleGUI	TkInter
	pip3 install pyqt6	installation	introduction
	G'day, Mate!	plan in rows	output
	My First Button	hello world	input
	Input Text	data entry	images local
		image display	images url
		more form elements	checkboxes
		colours, multiforms	listbox
		exercises	radio buttons
		track companion	more events
			auto teller
			more samples

unsorted
#	object-oriented	web scraping	other
	card deck	installation	trader game
	doc types	first scrape	access
	variable scope	bs4 functions	unsorted
	multiple classes	combining data sources	unsorted
	autoteller console	legality of scraping	spiral hello
	merge (recursive) sort	HTML pages for web scraping	Careflight data Glass artworks data

encryption
#	encryption 1	encryption 2
	Bacon Cipher	encryption basics 1
	Caeser Cipher	encryption basics 2
	Gronsfeld	encryption basics 3
	Vigenère	barcode scanner algorithm q13 mock
	One-time pad (OTP)	block cipher q15 school use only
	Feistel, DES and AES	block cipher q16 public use

more practise
#	challenge or activity
	exam 1 revision sheet
	exam 2 revision sheet
	exam 3 revision sheet
	Coins Challenge
	Dice Challenge
	Multicopier Context
	Bank Context
	Fast Food Context

print("Caesar Cipher")
plain_text = input("Enter plaintext message to encrypt: ")
cipher_text = []
for character in list(plain_text):
  #normalise characters for shifting by using a base 26 (0-25) ordinal system:
  plain_ordinal = ord(character) - ord("A") if character.isupper() else ord(character) - ord("a")
  #shift +3, and wrap using Modulo operator (%) if over length of alphabet (26):
  cipher_ordinal = (plain_ordinal + 3) % 26
  #return cipher as all uppercase to avoid patterns, as randomness makes for stronger encryption:
  cipher_text.append( chr( cipher_ordinal + ord("A") ) )
print("Encrypted ciphertext:", "".join(cipher_text))

Run Code

key = "A5D75" #Australian Signals Directorate 75th Anniversary

fifty_cent_coin_hex_chars = """
E3B
8287D4
290F723381
4D7A47A291DC
0F71B2806D1A53B
311CC4B97A0E1CC2B9
3B31068593332F10C6A335
2F14D1B27A3514D6F7382F1A
D0B0322955D1B83D3801CDB2
287D05C0B82A311085A03329
1D85A3323855D6BC333119D
6FB7A3C11C4A72E3C17CCB
B33290C85B6343955CCBA3
B3A1CCBB62E341ACBF72
E3255CAA73F2F14D1B27A
341B85A3323855D6BB33
3055C4A53F3C55C7B22
E2A10C0B97A291DC0F
73E3413C3BE392819
D1F73B331185A33
23855CCBA2A3
206D6BE383
1108B""".replace('\n', '').replace('\r', '') #remove new line chars

def extend(key, length): #to extend key to length of encrypted text
    return (key * (length//len(key) + 1))[:length]

def decrypt(a, b): #to XOR two hex (base 16) strings of the same length
    return "".join(["%x" % (int(x,16) ^ int(y,16)) for (x, y) in zip(a, b)])

keyblock = extend(key, len(fifty_cent_coin_hex_chars))
result = decrypt(fifty_cent_coin_hex_chars, keyblock) 
plaintext = bytes.fromhex(result).decode("ASCII")
print(plaintext)

Run Code