javascript to python

#        function mymin(a, b){
#            if (a < b){
#                return a;
#            } else {
#                return b;
#            };
#        }
#        
#        function square(x){
#            return x * x;
#        }
#        
#        write(mymin(square(-2), square(3)));

def mymin(a, b):
	if (a < b):
		return a
	else:
		return b

def square(x):
	return x * x
print mymin(square(-2), square(3))

[1,2,3,4,5,6,7]

def odds_only(numbers):
	for N in numbers:
		if N % 2 == 1:
			yield N

def small_words(words):
	for word in words:
		if len(word) <= 3:
			yield word

print [w for w in small_words(["The","quick","brown","fox"])]

grammar = [
	("exp",["exp","+","exp"]),
	("exp",["exp","-","exp"]),
	("exp",["(","exp",")"]),
	("exp",["num"]),
]

def expand(tokens, grammar):
	for pos in range(len(tokens)):
		for rule in grammar:

depth = 1
utterances = [["exp"]]

def sublists(big_list, selected_so_far):
	if big_list == []:
		print selected_so_far
	else:
		current_element = big_list[0]
		rest_of_big_list = big_list[1:]
		sublists(rest_of_big_list, selected_so_far + [current_element])
		sublists(rest_of_big_list, selected_so_far )

	dinner_guests = ["LM", "ECS", "SBA"]
	sublists(dinner_guests, [])

def cfgempty(grammar, symbol, visited):
	if symbol in visited:
		return None
	elif not any([rule[0] == symbol for rule in grammar ]):
		return [symbol]
	else:
		new_visited = visited + [symbol]
		for rhs in [r[1] for r in grammar if r[0] == symbol]:
			if all([None] != cfgempty(frammar, r, new_visited) for r in rhs):
				result = []
				for r in rhs:
					result = result + cfgempty(grammar, r, new_visited)
				return result
		return None