Overload () operator in Python

Question

I am trying to learn currying in Python for my class and I have to overload the () operator for it. However, I do not understand how can I can go about overloading the () operator. Can you explain the logic behind overloading the parentheses? Should I overload first ( and then ) or can I do any of these? Also, is there special name for parentheses operator?

Emulating callable objects

awesoon
– awesoon

2013-03-30 13:44:26 +00:00
Commented Mar 30, 2013 at 13:44 — awesoon
– awesoon, Commented Mar 30, 2013 at 13:44

Ned Batchelder · Accepted Answer · 2019-07-15 15:10:44Z

84

You can make an object callable by implementing the __call__ method:

class FunctionLike(object):
    def __call__(self, a):
        print("I got called with {!r}!".format(a))

fn = FunctionLike()
fn(10)

# --> I got called with 10!

edited Jul 15, 2019 at 15:10

answered Mar 30, 2013 at 13:49

Ned Batchelder

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3 Comments

jdyg Over a year ago

Can I make basic operations with that callable object, such as addition?

Ned Batchelder Over a year ago

You can provide almost all the language operations: docs.python.org/2/reference/datamodel.html#special-method-names

MadPhysicist Over a year ago

Is () a call operator that essentially calls the object in question with a certain argument (or absence thereof)?

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