def __init__(self, config):

self.permutation = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")

self.setConfig(config)

def setConfig(self, config):

if len(config) > 10:

print("Error, number of pairs in configuration must be at most 10 paris")

sys.exit(0)

elif len(config) > 0 and len(config) <= 10:

#checks if there are only 2 letters in each switch

for pair in config:

if len(pair)!=2:

print("plugboard configuration isn't legal")

sys.exit(0)

#checks if each letter appear only once in the configuration

for pair in config:

for pair2 in config:

if pair != pair2:

if pair2.count(pair[0]) !=0 or pair2.count(pair[1]) !=0:

print("illegal plugboard configuration, each pair of letters must contain different letters")

sys.exit(0)

for pair in config:

f_letter = pair[0]

s_letter = pair[1]

f_index = Translator.letterToindex(f_letter)

s_index = Translator.letterToindex(s_letter)

self.permutation[f_index] = s_letter

self.permutation[s_index] = f_letter

def translation(self, letter):