... file . ... example.snake: better rules for chasing enemy tail . ... line source . ... 5 def preprocess ( line ): . 6 """Remove comments and junk spaces from line of snake definition file.""" . ... 14 def __init__ ( self , file ): . ... 21 def enumerate_lines ( self ): . ... file , self . ... 31 - `cells` -- list of cells belonging to the snake The first of these cells . ... 106 assert len ( line ) == 8 , "Rule lines must be exactly 7 chars long" . ... 115 def parse_cell ( self , x , y , char ): . ...