Is there a Python equivalent for Scala's Option or Either?

Question

I really enjoy using the Option and Either monads in Scala. Are there any equivalent for these things in Python? If there aren\'t, then what is the pythonic way of handling erro

Answer 1

Try This:

from monad import Monad

class Either(Monad):
  # pure :: a -> Either a
  @staticmethod
  def pure(value):
    return Right(value)

  # flat_map :: # Either a -> (a -> Either b) -> Either b
  def flat_map(self, f):
    if self.is_left:
      return self
    else:
      return f(self.value)

class Left(Either):
  def __init__(self, value):
    self.value = value
    self.is_left = True

class Right(Either):
  def __init__(self, value):
    self.value = value
self.is_left = False