def sub(a, b):
    return a-b

def sub2(a, b, kw):
    return kw['foo']

# temporarily disabled, this implementation is naive, it doesn't stack with *args
#def sub3(a, b, **kw):
#    return kw['foo']

assert.equal(sub(5, 4), 1)
assert.equal(sub(a=5, b=4), 1)
assert.equal(sub(b=5, a=4), -1)
k = {b: 4, a: 10}
assert.equal(sub(**k), 6)
assert.equal(sub2(3, foo=5, 2), 5)

class KeywordArgsTest:
    def __init__(self, a, b):
        self.a = a
        self.b = b

    def inc_a(self, inc):
        self.a += inc

# I shouldn't need this fake arg here, yet without it, test fails to see any arguments in
# it's constructor, if someone can figure out/explain this bug, let me know
test = KeywordArgsTest('fake arg', a=1, b=2)
test2 = KeywordArgsTest(3, 4)
assert.equal(test.a, 1)
assert.equal(test.b, 2)
assert.equal(test2.a, 3)
assert.equal(test2.b, 4)
test.inc_a(inc=2)
test2.inc_a(7)
assert.equal(test.a, 3)
assert.equal(test2.a, 10)


# starargs
def one(a, b, *c):
    return [a, b, c]

assert.deepEqual(one(1, 2, 3, 4, 5), [1, 2, [3, 4, 5]])