3.1 Problem 1 and 3

def encode(n, seq):
    its = [iter(seq)]*n
    return zip(*its)

def Playfair(s):
    keystring = []
    for j in s+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
        if j not in keystring:
            keystring.append(j)
    return list(take(5, keystring))

print (Playfair("EVENTHOUGHTHECOLDWARHASCOMEANDGONEITSCHILLWINDSSTILLBLOW"))
#[('E', 'V', 'N', 'T', 'H'), ('O', 'U', 'G', 'C', 'L'), ('D', 'W', 'A', 'R', 'S'), ('M', 'I', 'B', 'F', 'J'), ('K', 'P', 'Q', 'X', 'Y')]

def encode(n, seq):
    its = [iter(seq)]*n
    return zip(*its)

def Playfair(s):
    keystring = []
    for j in s+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
        if j not in keystring:
            keystring.append(j)
    return list(take(5, keystring))
print (Playfair("All those who believe in psychokinesis raise my hand"))

#[('A', 'l', ' ', 't', 'h'), ('o', 's', 'e', 'w', 'b'), ('i', 'v', 'n', 'p', 'y'), ('c', 'k', 'r', 'a', 'm'), ('d', 'B', 'C', 'D', 'E'), ('F', 'G', 'H', 'I', 'J'), ('K', 'L', 'M', 'N', 'O'), ('P', 'Q', 'R', 'S', 'T'), ('U', 'V', 'W', 'X', 'Y')]


alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
len(alphabet)
#26
import random
alpha2 = []
for i in alphabet: alpha2.append(i)
playFair = []
row = []
while(len(alpha2))>1:
    index = random.randint(0,len(alpha2)-1)
    row.append(alpha2[index])
    alpha2.remove(alpha2[index])
    if len(row) == 5:
        playFair.append(row)
        row = []
for row in playFair:
    print(row)

print("left out letter: ", alpha2)

#['G', 'R', 'X', 'M', 'F']
#['J', 'H', 'S', 'V', 'O']
#['U', 'W', 'L', 'D', 'Z']
#['I', 'C', 'P', 'A', 'B']
#['N', 'T', 'E', 'Q', 'Y']
#left out letter:  ['K']