vlazzle

def test_filtered_really_in_2(y, xs):
    def pred(e): return e is y
    return filter(pred, xs)

vlazzle

def really_in(y, xs):
    if y is not True and y is not False:
        '''thanks http://www.reddit.com/r/Python/comments/asmwr/python_boolean_coercion_gotchas/c0j7cd7?context=3'''
        return y in xs
    
    for x in xs:
        if y is x: return True
    return False

True in [1, 2, 3]                   # -> True

vlazzle

/*
 * usage example:
 *   $('body').zIndices()
 *
 * Returns a hash with z-indices as keys whose corresponding
 * values are elements with that z-index set. Any z-index <z>
 * having more than one element will also be in the hash
 * under the key '!<z>' (to be sorted together near the top),
 * as well as the regular key, '<z>'.
 */

vlazzle

#################################################
# currying and partial application in python    #
# based on code from Simon Willison's geocoders #
#################################################

# curries fn, a function of exactly 2 parameters
def partial2(fn):
    def inner1(arg2):
        def inner2(arg1):
            return fn(arg1, arg2)

vlazzle

http://en.wikipedia.org/wiki/Church_numerals#Church_pairs (example)

fst (pair a b)
\p.p (\x.\y.x) ((\x.\y.\z.z x y) a b)
\p.p (\x.\y.x) (\z.z a b)
???
(\z.z a b) (\x.\y.x)
(\x.\y.x) a b
a