I would like to know if the use of ** kwargs in a constructor is the best alternative or if there is a better path for cases similar to the ones below:
class Duvida(object):
def __init__(self, **kwargs):
self.formato=''
self.nota='5'
if 'formato' in kwargs.keys():
self.formato=kwargs['formato']
if 'nota' in kwargs.keys():
self.nota=kwargs['nota']
q=Duvida(formato='Formato Personalizado')
The best way is to explicitly state the arguments. Quoting Zen of Python :
Explicit is better than implicit
In this case, if you want to leave the parameters as optional, simply initialize them with a default value:
class Duvida(objet):
def __init__(self, formato=None, nota=None):
self.formato = formato if formato is not None else ''
self.nota = nota if nota is not None else '5'
duvida = Duvida(formato='Formato Personalizado')
This avoids the problem of initializing parameters with changeable types, such as list.
When is a default argument evaluated in Python?
But if your values are immutable, initializing them with your own value should not generate any side effects in the program:
class Duvida(objet):
def __init__(self, formato='', nota='5'):
self.formato = formato
self.nota = nota
duvida = Duvida(formato='Formato Personalizado')
Use only *args and **kwargs when you do not know the parameters previously.