I am trying to understand maybe Monad but most of the examples I saw used some language-specific feature. To ensure that I have gotten it conceptually right I thought of writing a generic implementation. Below is what I came up with.

Can someone tell if I have gotten it conceptually right? Is there a better way to generalize it?

def f():
    return 2

def g():
    return 4

def h():
    return 7

def i():
    return None

def bind(val, func):
    if val is None:
        return None
    else:
        return(func())

unit = 0

>>> bind(bind(bind(unit,f),i),h) #Returns nothing
>>> bind(bind(bind(unit,f),g),h) #Returns a value
>>>7

What if I wanted to add the values from these functions and abort if any of those was NULL; any suggestion?

python haskell monads
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