How to pass a method as argument?

[Avi Gross]

Sounds like an excellent homework question.

But your method of using an object is not what first comes to mind based on
your cursory description.

There is a python idiom using functional programming that looks like this:

def doit(a, b, fun): return(fun(a,b))
	
So make up your own functions like:

def addit(a,b): return(a+b)

And make up others doing multiply and whatever and call something like this:

doit(3,5, addit)

 Now if you want a user to put in text like "add" that is another story. If
you want this in the context of an object, ditto.


-----Original Message-----
From: Python-list <python-list-bounces+avigross=verizon.net at python.org> On
Behalf Of Anil Anvesh
Sent: Thursday, September 30, 2021 1:11 AM
To: python-list at python.org
Subject: How to pass a method as argument?

I want to write a python calculator program that has different methods to
add, subtract, multiply which takes 2 parameters. I need to have an execute
method when passed with 3 parameters, should call respective method and
perform the operation. How can I achieve that?



class calc():
    def __init__(self,a,b):
        self.a=a
        self.b=b
        
    def ex(self,fun):
        self.fun=fun
        if fun=="add":
            self.add()
    
    def add(self):
        return self.a+self.b
    def sub(self):
        return self.a-self.b
    def mul(self):
        return self.a*self.b
    def div (self):
        return self.a/self.b
    def execu(
obj1=calc()
obj1.execu("add",1,,2)
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