python，从另一个 class 调用方法

Question

I am trying to call the sum_method function from my evaluation class to my main one, however I run into many errors. I want to use the new_data as the data parameter of my sum_method function.

evaluation class:

class evaluation():

    def __init__(self, data):
        self.data = data

    def sum_method(self):
        montant_init = self.data.loc[self.data['Initiateur'] == 'Glovoapp', 'Montant (centimes)'].sum()
        print(montant_init)

main class:

class main(evaluation):

        new_data.to_csv("transactions.csv", index=False)

        self.data = new_data

    def call_sum(self, new_data):
       
        init_eval = evaluation.sum_method(self=new_data)
        print(init_eval)


init_evalobj = main()
init_evalobj.call_sum()

Answer 1

if you use the method in your inherence class just use self

so:

init_eval = self.sum_method()

the self argument is passed in python automaticly as first parameter

update you also should return a value:

    def sum_method(self):
        montant_init = self.data.loc[self.data['Initiateur'] == 'Glovoapp', 'Montant (centimes)'].sum()
        print(montant_init)
        return montant_init

Answer 2

I'd suggest making some changes to the both classes, to encapsulate the.data member variable in the base class. My preference would also be to separate out the calculation from the display, so leave all the print statements in the call_sum() function.

class evaluation:

    def __init__(self, data):
        self.data = data

    def sum_method(self):
        montant_init = self.data.loc[self.data['Initiateur'] == 'Glovoapp', 'Montant (centimes)'].sum()
        return montant_init


class main(evaluation):

    def __init__(self):
        # Reduce csv content to what's needed for analysis
        data_csv = pd.read_csv('transactions.csv')

        # --> removing unnecessary data
        new_data = data_csv[['Opération', 'Initiateur', 'Montant (centimes)', 'Monnaie',
                             'Date', 'Résultat', 'Compte marchand', 'Adresse IP Acheteur', 'Marque de carte']]

        # --> saving changes...
        new_data.to_csv("transactions.csv", index=False)

        super().__init__(new_data) //Initialize the base class

    def call_sum(self):
        print('Glovoapp "montant" generated')
        init_eval = self.sum_method() //Call the method from the base class
        print(init_eval)