[Solved] How would I make a simple encryption/decryption program? [closed]

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Use two dicts to do the mapping, one from letters to encryption_code and the reverse to decrypt:

letters="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
encryption_code="LFWOAYUISVKMNXPBDCRJTQEGHZ"

enc = dict(zip(letters,encryption_code))

dec = dict(zip(encryption_code, letters))


s = "HELLO WORLD"

encr = "".join([enc.get(ch, ch) for ch in s])
decr = "".join([dec.get(ch, ch) for ch in encr])

print(encr)
print(decr)

Output:

IAMMP EPCMO 
HELLO WORLD

Using your method your input will have to be uppercase and the user is restricted to A-Z for the letters to be encrypted, if you want to allow other characters just add the mapping to the dicts.

letters="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
encryption_code="LFWOAYUISVKMNXPBDCRJTQEGHZ"
letters += letters.lower()
encryption_code += encryption_code.lower()
enc = dict(zip(letters,encryption_code))

dec = dict(zip(encryption_code, letters))


s = "HELLO world"

encr = "".join([enc.get(ch, ch) for ch in s])
decr = "".join([dec.get(ch, ch) for ch in encr])

print(encr)
print(decr)

Output:

IAMMP epcmo
HELLO world

Any characters not in letters will be the same in encr and decr i.e:

 s = "HELLO world!#}%"
 IAMMP epcmo!#}% # encr
 HELLO world!#}% # decr

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solved How would I make a simple encryption/decryption program? [closed]