def seek(self, pos):
        """ Move to new input file position. If position is negative or out of file, raise Exception. """
        if (pos > self.file_size) or (pos < 0):
            raise Exception("Unable to seek - position out of file!")
        self.file.seek(pos)
def seek ( self , pos ) : if ( pos > self . file_size ) or ( pos < 0 ) : raise Exception ( "Unable to seek - position out of file!" ) self . file . seek ( pos )
Move to new input file position. If position is negative or out of file, raise Exception.