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Python Object-Oriented Python (retired) Inheritance Score Method

Posted by Imer Pacheco
Imer Pacheco
9,732 Points

Regard the "score" method in the game.py, in the Object-Oriented Python course.

I'm getting a syntax error in the section that tries to add 1 to the self.current_score section. To me it looks correct but apparently it is not. Any guidance on this matter would be greatly appreciated.

Here is my code:

class Game:
  def __init__(self):
    self.current_score = [0, 0]

  def score(player):
    if player == 1:
      self.current_score[0] = self.current_score[0] += 1
    else:
      self.current_score[1] = self.current_score[1] += 1

4 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,454 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points

you can not mix multiple variable assignments with the "plus equals" incremental assignment

# change
      self.current_score[0] = self.current_score[0] += 1
# to either
      self.current_score[0] = self.current_score[0] + 1
# or to 
      self.current_score[0] += 1
Imer Pacheco
Imer Pacheco
9,732 Points

Hello again, Mr. Freeman! Thanks again for your input, however, I am still struggling with this challenge. Here is my revised code: 

class Game:
  def __init__(self):
    self.current_score = [0, 0]

  def score(player):
    if player == 1:
      self.current_score[0] = self.current_score[0] + 1
      return self.current_score[0]
    else:
      self.current_score[1] = self.current_score[1] + 1
      return self.current_score[1]

I'm sure it's something silly but I can't seem to put my finger on it. Thanks!

Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points

Apologies. I should have caught this error on initial inspection. The method score() must have the instance as the first parameter:

  def score(self, player):  # <-- added 'self'
James N
James N
17,864 Points
James N
James N
17,864 Points

thanks! this also helped me out! (i couldn't get past a few codeChallenges because of the self attribute...)

Imer Pacheco
Imer Pacheco
9,732 Points
Imer Pacheco
Imer Pacheco
9,732 Points

Ah yes! I was thinking to myself "How is the value of the player argument being relayed to the self.current_score attribute? Now I know. Thank you again Mr. Freeman!

Imer Pacheco
Imer Pacheco
9,732 Points
Imer Pacheco
Imer Pacheco
9,732 Points

You got it, Chris!

Jonathon Mohon
Jonathon Mohon
3,165 Points
Jonathon Mohon
Jonathon Mohon
3,165 Points

Will all methods of a class require the self parameter because I made this exact mistake myself.

Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,454 Points

Jonathon, All methods of a class should have a first parameter to represent the class instance referred to (usually "self" for instance methods), or the the class itself (usually "cls" for class-based methods). Note the actual variable names can be anything "self" and "cls" are simply conventions for readability.