def is$\_$space$($lines$,$ chr$\_$current, col$)$:

for line in lines:

result $=$ line$[$col$]^$ chr$\_$current

if not $($chr$($result$).$isalpha$()$ or result $==0)$:

return False

return True

def frequency$\_$analysis$($ciphertexts$)$:

frequencies $=\{\}$

total$\_$chars $=0$

for line in ciphertexts:

for char in line:

frequencies$[$char$]=$ frequencies.get$($char$,0)+1$

total$\_$chars $+=1$

normalized$\_$frequencies $=\{$char: count $/$ total$\_$chars for char, count in frequencies.items$()\}$

sorted$\_$frequencies $=$ sorted$($normalized$\_$frequencies.items$(),$ key$=$lambda x: x$[1],$ reverse$=$True$)$

return sorted$\_$frequencies

def decrypt$\_$columns$($cipher$\_$texts, texts, key, frequency$\_$mapping$)$:

space $=$ ord$(\text{'}\text{'})$

length$\_$max $=$ max$($len$($line$)$ for line in cipher$\_$texts$)$

for col in range$($length$\_$max$)$:

next$\_$cipher $=[$line for line in cipher$\_$texts if len$($line$)>$ col$]$

for cipher in next$\_$cipher:

if is$\_$space$($next$\_$cipher, cipher$[$col$],$ col$)$:

index $=0$

for text$\_$index in range$($len$($texts$))$:

if len$($texts$[$text$\_$index$])!=0$ and col $<$ len$($texts$[$text$\_$index$])$:

result $=$ cipher$[$col$]^$ next$\_$cipher$[$index$][$col$]$

if result $==0$:

texts$[$text$\_$index$][$col$]=$ space

else:

texts$[$text$\_$index$][$col$]=$ ord$($frequency$\_$mapping.get$($chr$($result$),$ chr$($result$))[0])$

key.append$($format$($result$,\text{'}08$b$\text{'}))$

index $+=1$ explain this code with real life example