import   string  
   
  DEFAULT_CHAR_SET     =   string.letters   +   string.digits   +   string.punctuation  
   
  class   PasswordGenerator(object)   :  
          def   __init__(self,   seeds   =   DEFAULT_CHAR_SET)   :  
                  self.seeds     =   seeds  
                  self.Outer     =   None  
                  self.cursor   =   0  
          def   next(self)   :  
                  self.cursor   +=   1  
                  if   self.cursor   ==   len(self.seeds)   :  
                          self.cursor   =   0  
                          if   not   self.Outer   :  
                                  self.Outer   =   PasswordGenerator(self.seeds)  
                          else   :  
                                  self.Outer.next()  
          def   value(self)   :  
                  if   self.Outer   :  
                          return   self.Outer.value()   +   self.seeds[self.cursor]  
                  else   :  
                          return   self.seeds[self.cursor]  
          def   __iter__(self)   :  
                  while   1   :  
                          yield   self.value()  
                          self.next()  
           
  if   __name__   ==   "__main__"   :  
          g   =   PasswordGenerator()  
          for   i   in   g   :  
                  print   i