pyfun.py

from itertools import chain, imap

def curry(fn):
    def curried(*args, **kwargs):
        if len(args) + len(kwargs) >= fn.__code__.co_argcount:
            return fn(*args, **kwargs)
        return (lambda *args2, **kwargs2:
                curried(*(args + args2), **dict(kwargs, **kwargs2)))
    return curried

@curry
def flatmap(f, xs):
    return chain.from_iterable(imap(f, xs))
  
  
@curry
def from_noneable(callable, arg):
    try:
        result = callable(arg)
        return [result] if result is not None else []
    except Exception:
        return []

def flip(f):
    return lambda *y: f(*reversed(y))
      
maybe = from_noneable      
head = lambda x: x[0]
safe_head = from_noneable(head)

div = curry(lambda x, y: x / y)

flatmap(from_noneable(flip(div)(10)), [10, 5, 0, 1])