decrypt caesar cipher | Python Fiddle

from Numeric import *  
from string import maketrans  
  
def translator(text,alphabet,key):  
    trantab = maketrans(alphabet,key)  
    return text.translate(trantab)  
  
def caesar_decode(ciphertext,s):  
    alpha="abcdefghijklmnopqrstuvwxyz"  
    return translator(ciphertext,alpha,alpha[-s:]+alpha[:-s])  
  
  
  
  
class frequency_analysis:  
    def __init__(self, ciphertext):  
        self.cor=[0.64297,0.11746,0.21902,0.33483,1.00000,0.17541,  
        0.15864,0.47977,0.54842,0.01205,0.06078,0.31688,0.18942,  
        0.53133,0.59101,0.15187,0.00748,0.47134,0.49811,0.71296,  
        0.21713,0.07700,0.18580,0.01181,0.15541,0.00583]  
        self.ciphertext=ciphertext.lower()  
        self.freq()  
        self.min_error()  
        self.key=self.minimum[0]  
        self.solution=caesar_decode(self.ciphertext,self.minimum[0])  
  
    def freq(self):  
        self.arr=zeros(26,Float64)  
        for l in self.ciphertext:  
            x=ord(l)  
            if (x>=97 and x<=122):  
                self.arr[x-97]+=1.0  
        self.arr/=max(self.arr)  
  
    def error(self):  
        e=0  
        for i in range(0,len(self.arr)):  
            e+=abs(self.arr[i]-self.cor[i])**2  
        return e  
  
    def min_error(self):  
        self.minimum=[0,10000]  
        for rot in range(0,25):  
            e=self.error()  
            print rot,e  
            if e<self.minimum[1]:  
                self.minimum[1]=e  
                self.minimum[0]=rot  
            x=self.arr[-1]  
            del self.cor[-1]  
            self.cor.insert(0,x)  
  
ciphertext=(raw_input("ciphertext: ")) 
FA=frequency_analysis(ciphertext)  
print FA.solution

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