Return to Answer

if self.direction == "left":
    self.expand_snake(-w, 0):
elif self.direction == "down":
    self.expand_snake(0, w):
elif self.direction == "right":
    self.expand_snake(w, 0):
elif self.direction == "up":
    self.expand_snake(0 -w):

if self.direction == "left":
    self.expand_snake(-w, 0):
elif self.direction == "down":
    self.expand_snake(0, w):
elif self.direction == "right":
    self.expand_snake(w, 0):
elif self.direction == "up":
    self.expand_snake(0, -w):

##duplicated code Any time you see code that does essentially the same thing you should consider re-writing it. Python is highly amenable to the don't-repeat-yourself idea so keep that in mind.

duplicated code

Any time you see code that does essentially the same thing you should consider re-writing it. Python is highly amenable to the don't-repeat-yourself idea so keep that in mind.

"magic variables" are often less clear than explicit named variables.

"magic variables" are often less clear than explicit named variables.