AttributeError for function called in another function within same class - Python

Question

When I run the following code I get an AttributeError: 'set' object has no attribute findMean. What am I doing wrong?

class BasicStats:    

    def findMean(self, num = {}):
        length = len(num)

        sum = 0
        for x in num:
            sum = sum + x

        mean =sum/length
        return mean     

    def findVariance(self, num = {}):
        mean = self.findMean(num)
        length = len(num)

        squared_difference = 0
        for x in num:
            squared_difference = squared_difference + (x-mean)**2

        variance = squared_difference/length
        return variance

    arr = {1, 23, 343.34, 2}    
    findVariance(arr)

Community · Accepted Answer · 2017-05-23 12:14:53Z

3

It's because self in that scope is a set. More specifically, it is arr (which is a set and you pass in as the first argument).

The self keyword only works for functions called against an instance of a class (this special type of functions are called methods, read more here.)

edited May 23, 2017 at 12:14

CommunityBot

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answered Jul 31, 2016 at 21:11

David Gomes

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2 Comments

user2465510 Over a year ago

Thanks for the help. What do I need to do to get it to work?

David Gomes Over a year ago

You should try something like the following outside the class: stats = BasicStats() and then print(stats.findMean(arr))

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