Cisear Cipher code

import string
j = ' '

def buildCoder(shift):    
    n = shift     
    cnt=1
    for i in string.ascii_uppercase:
        if cnt==1:
          print '{','\b',    
        j= (ord(i)-ord('A') + n)%26 + ord('A')
        print '\''+i +'\''+': '+'\''+unichr(j)+'\'','\b',
        print '\b,',
        cnt=cnt+1
    
    for i in string.ascii_lowercase:
       j= (ord(i)-ord('a') + n)%26 + ord('a')
       print '\''+i +'\''+': '+'\''+unichr(j)+'\'','\b',
       if i=='z':
        print ''
       else: 
        print '\b,',
       #print i  + ':' + unichr(j),'\b',
    print '','\r}'

buildCoder(3)