code: def encipher(self,string):
                              
          string = self.remove_punctuation(string)    
          ret = ''
          ind = self.sortind(self.keyword)
          for i in range(len(self.keyword)):
              ret += string[ind.index(i)::len(self.keyword)]
          return ret
docs: Encipher string using Columnar Transposition cipher according to initialised key. Punctuation and whitespace
          are removed from the input.       
  
          Example::
  
              ciphertext = ColTrans('GERMAN').encipher(plaintext)     
  
          :param string: The string to encipher.
          :returns: The enciphered string.