Curry in Python

Curry.py

from inspect import signature


def get_params_len(fn): return len(signature(fn).parameters)


def curry(fn):
    fn_params_len = get_params_len(fn)
    temp_params = []

    def _(*args):
        if (len(args) + len(temp_params)) <= fn_params_len:
            temp_params.append(*args)
    
            if len(temp_params) == fn_params_len:
                return fn(*temp_params)
            
            return _

        raise Exception('Number of arguments was too much')

    return _

HOWTO-EN.md

How this works

Using decorator(@) notation

from Curry import curry

@curry
def split_by(character, word):
    return word.split(character)

OR passing the function to be curried to curry function.

def split_by(character, word):
    return word.split(character)

split_by = curry(split_by)

When we use curry on a function, allow us to "consume" such function, bit by bit, also called partial application of the function. We don't need to pass all the parameter at once.

split_by_spaces = split_by(' ')
split_by_spaces('Hello my name is Emerson')
#['Hello', 'my', 'name', 'is', 'Emerson']

HOWTO-PT-BR.md

Como funciona

Usando decorator(@)

from Curry import curry

@curry
def split_by(character, word):
    return word.split(character)

OU passando a função que vai ser aplicado o curry, para a função curry.

def split_by(character, word):
    return word.split(character)

split_by = curry(split_by)

Quando usamos curry em uma função, nos permite "consumir" a mesma função pouco a pouco, também chamado de aplicação parcial da função. Nós não precisamos passar todos os parâmetros de uma vez.

split_by_spaces = split_by(' ')
split_by_spaces('Hello my name is Emerson')
#['Hello', 'my', 'name', 'is', 'Emerson']