Iterate over each element of a set in order. It is well-known that one can easily do it in reverse order by doing i = (i-1)&superset (see https://www.topcoder.com/community/data-science/data-science-tutorials/a-bit-of-fun-fun-with-bits/)

in_order_iterate.py

def binary(x) :
	return format(x,'b')

def print_binary(x) :
	print binary(x)

def iterate(superset,f) :
	i = 0
	while True :
		f(i)
		if i == superset :
			break
		i = ((i|(~superset))+1)&superset

iterate(53,print_binary)