Pass text and shift number .

Cipher Ceaser

coder=3
text='Hello, world!'
j = ' '
n = coder     
for i in text:
        if(i>'A'and i<'Z'):
          j= (ord(i)-ord('A') + n)%26 + ord('A')
          print '\b'+unichr(j), 
          #print (unichr(j), end=' ')
        elif(i>'a'and i<'z'):
          j= (ord(i)-ord('a') + n)%26 + ord('a')
          print  '\b'+unichr(j),
        else:
           print '\b'+i,