Python equivalent to JavaScript function object

Question

I would like to know if there is a Python equivalent to this JavaScript construct:

var myFunctions = {
    'greet': function(name){
        return "Hello, " + name;
    },

    'farewell': function(time){
        return "See you " + time;
    }
}

So I can call the functions this way:

let greetMarta = myFunctions['greet']("Marta");

All functions are first-class objects in Python. Are you asking about anonymous functions? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jan 23, 2018 at 9:43

Manuel Perez Heredia · Accepted Answer · 2019-08-21 17:03:37Z

5

You can use lambda to define very simple functions like these inline; however they can only consist of one expression:

    my_functions = {
        'greet': lambda name: "Hello {}".format(name),
        'farewell': lambda time: "See you {}".format(time)
    }

For anything more complicated you need to define a standalone function and then reference it in the dict:

    def my_complex_function(param):
        ... logic ...
        return whatever

    my_functions = {
        'complex_func': my_complex_function,
        ...
    }

And in order to call the function you can do:

my_functions['my_complex_function'](param)

edited Aug 21, 2019 at 17:03

Manuel Perez Heredia

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answered Jan 23, 2018 at 9:44

Daniel Roseman

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2 Comments

Manuel Perez Heredia Over a year ago

Thanks. Show me how I would call it pls

Daniel Roseman Over a year ago

Exactly the same as in JS: my_functions['greet']('Victor').

Chaitanya Sama · Accepted Answer · 2018-01-23 09:44:29Z

1

def greet(name):
    return "Hello, " + name

def farewell(time):
    return "See you " + time

my_functions = 
{
    "greet": greet,
    "farewell": farewell
}

answered Jan 23, 2018 at 9:44

Chaitanya Sama

3303 silver badges13 bronze badges

Comments

zabusa · Accepted Answer · 2018-01-23 09:45:36Z

1

def greet(name):
    return "Hello, " + name;

def farewell(time):
    return "See you " + time;

my_dict = {'greet' : greet, 
           'farewell' : farewell}

greetMarta = my_dict['greet']("Marta");

use dictionary to get the functions and execute

answered Jan 23, 2018 at 9:45

zabusa

2,72926 silver badges26 bronze badges

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