[wechall challenge] Training: Crypto - Substitution I

import operator
import re

bindosu_dict = {}
for i in range(ord('A'), ord('Z') + 1):
   bindosu_dict[chr(i)]=0

def bindosu(data):
    global bindosu_dict
    for i in range(ord('A'), ord('Z') + 1):
        for j in range(0, len(data)):
            if ord(data[j]) == i:
               bindosu_dict[chr(i)] = bindosu_dict[chr(i)]+1

def add_result(current_result,calulate_result):
    result = ""
    for i in range(0,len(current_result)):
        if (current_result[i]=="_" and calulate_result[i]=="_") or (current_result[i]==" " and calulate_result[i]==" "):
            result += current_result[i]
        elif current_result[i].isalpha():
            result += current_result[i]
        elif calulate_result[i].isalpha():
            result += calulate_result[i]
    return result

bindosu("JV KAS WGUMNAKV NZI VZO RWH QSWI KAMB UV FQMSHI M WU MUCQSBBSI ESQV LSGG IZHS VZOQ BZGOKMZH PSV MB UWIRFRHAMMII KAMB GMKKGS RAWGGSHNS LWB HZK KZZ AWQI LWB MK")

res = sorted(bindosu_dict.items(), key=operator.itemgetter(1), reverse = True)

bindosu_result = ""
for i in range(0,len(res)):
   bindosu_result += str(res[i][0]) + "=" + str(res[i][1]) + ", "
print bindosu_result

target = "JV KAS WGUMNAKV NZI VZO RWH QSWI KAMB UV FQMSHI M WU MUCQSBBSI ESQV LSGG IZHS VZOQ BZGOKMZH PSV MB UWIRFRHAMMII KAMB GMKKGS RAWGGSHNS LWB HZK KZZ AWQI LWB MK"
target_1 = "__ ___ ________ ___ ___ ___ ____ ____ __ ______ _ __ _________ ____ ____ ____ ____ ________ ___ __ ____________ ____ ______ _________ ___ ___ ___ ____ ___ __"
print target
while True:
    a = raw_input("string = ")
    b = raw_input("string = ")
    tmp = re.sub('[^' + a + '|\s]', '_',target)
    tmp = re.sub('[' + a + ']', b, tmp)

    target_1 = add_result(target_1,tmp)
    print target
    print target_1

Flag = BY THE ALMIGHTY GOD YOU CAN READ THIS MY FRIEND I AM IMPRESSED VERY WELL DONE YOUR SOLUTION KEY IS MADCFCNHIIDD THIS LITTLE CHALLENGE WAS NOT TOO HARD WAS IT