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def decalage(lettre,clef):
liste=['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z']
if lettre not in liste:
return lettre
else:
return liste[liste.index(lettre)+clef]
msg_chiffre = str()
while True:
msg = input('Entrez le texte à chiffrer (q pour quitter) : ')
if msg.lower() == "q":
print("bye")
exit()
clef = int(input('Entrez votre clef : '))
for lettre in msg:
msg_chiffre += decalage(lettre,clef)
print(msg_chiffre)
msg_chiffre = ""
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