How to use function inside a class python

Question

I want to use a function implemented inside a class as followed:

class calcul:
    def func(a,b):
        return log(a/b)
    def sec_func(c,d):
        out = func(c,d)
        return out

I've tried to initiate the function:

class calcul:
    def __init__(self):
        self.func(a,b)
    def func(a,b):
        return log(a/b)
    def sec_func(self,c,d):
        out = self.func(c,d)
        return out

however, I get 'func is not defined' as output

What is ```a``` and ```b``` in ```self.func(a,b)```? and It's better to use ```Calcul``` as class name(first letter uppercase) — Mehdi Mostafavi, Aug 18 '20 at 09:33

score 3 · Accepted Answer · answered Aug 18 '20 at 09:34

You are probably missing the self as first argument of your functions. Else you should declare them as @staticmethod. What you probably want to do is

class Calcul:
    def func(self,a,b):
        return log(a/b)
    def sec_func(self,c,d):
        out = self.func(c,d)
        return out

Lewis Morris · Answer 2 · 2020-08-18T12:17:48.213

1

You would create a class like so.

#define the class
class Calcul:
    def __init__(self):
        pass
        #pass becuase no attributes to store
    def func(self, a, b):
        return log(a/b)
    def sec_func(self,c,d):
        out = self.func(c,d)
        return out

#create a new instance of the class
calc_obj = Calcul()

#call the function using the class variable you have just defined.

ans = calc_obj.func(1,2)
ans1 = calc_obj.sec_func(1,2)

edited Aug 18 '20 at 12:17

answered Aug 18 '20 at 09:34

Lewis Morris

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I get an error when running this: `func() takes 2 positional arguments but 3 were given` – quamrana Aug 18 '20 at 09:43
my bad, i've edited it. `func` needs the self input parameter – Lewis Morris Aug 18 '20 at 12:17

How to use function inside a class python

2 Answers2