NameError when calling a class method

Question

trying to understand classes and methods in Python 3.7. I keep running the code below, but keep getting this NameError, associated with the points variable I established in the initialize method of the Stats class. I believe the error is the result of some problem recognizing local/global variables, but can't put my finger on it. Does anyone have any ideas?

class Stats:
    def __init__(self, points, rebounds, assists, steals):
        self.points = points
        self.rebounds = rebounds
        self.assists = assists
        self.steals = steals

    def tripDub(self):
        if points >= 10 and rebounds >= 10 and assists >= 10 and steals >= 10:
            return "Yes!"
        else:
            return "Nope!"

s = Stats(30, 20, 9, 5)
print("Did he earn a Triple Double? Result:", s.tripDub())

In the tripDub() method you need to refer to class variables using self. e.g. `if self.points >= 10 and self.rebounds >= 10 and self.assists >= 10 and self.steals >= 10:` — Maximus, Apr 22 '19 at 04:12
If any of the answers solved your question, it's good practice to upvote them and accept the best one. The latter also grants you a small rep bonus :) — Alec, May 14 '19 at 22:08
Think carefully about the logic. Where the code says `self.points = points`, why does it not simply say `points=points`? What does the `self.` part mean? Do you see how this applies to the `tripDub` method as well? — Karl Knechtel, Sep 05 '22 at 09:24

score 4 · Answer 1 · answered Apr 22 '19 at 04:13

You need self. before referencing instance variables:

class Stats:
    def __init__(self, points, rebounds, assists, steals):
        self.points = points
        self.rebounds = rebounds
        self.assists = assists
        self.steals = steals

    def tripDub(self):
        if self.points >= 10 and self.rebounds >= 10 and self.assists >= 10 and self.steals >= 10:
            return "Yes!"
        else:
            return "Nope!"


s = Stats(30, 20, 9, 5)
print("Did he earn a Triple Double? Result:", s.tripDub())

score 3 · Answer 2 · answered Apr 22 '19 at 04:13

3

You need to reference points, rebounds, assists and steals using self in the tripDub function.

Example: self.points

answered Apr 22 '19 at 04:13

JeremyFromEarth

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NameError when calling a class method

2 Answers2