Python – call multiple methods in a single call

Question

how can i call multiple methods of an object at the same time in python. in php I can do this:

class Client{
    public ac1(){ ... }

    public ac2(){ ... }
}

$client = new client();
$client->ac1()->ac2(); <-- I want to do it here

how would you do it in python?

Asked By: Renato Souza de Oliveira

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Source

Answer 1

The example you gave of PHP code does not run the methods at the same time – it just combines the 2 calls in a single line of code. This pattern is called a fluent interface.

You can do the same in Python as long as a method you’re calling returns the instance of the object it was called on.

I.e.:

class Client:
    def ac1(self):
        ...
        return self

    def ac2(self):
        ...
        return self


c = Client()
c.ac1().ac2()

Note that ac1() gets executed first, returns the (possibly modified in-place) instance of the object and then ac2() gets executed on that returned instance.

Some major libraries that are popular in Python are moving towards this type of interface, a good example is pandas. It has many methods that allow in-place operations, but the package is moving towards deprecating those in favour of chainable operations, returning a modified copy of the original.

Answered By: Grismar

Python – call multiple methods in a single call

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