insertion_sort.py

def insertion_sort(m, sort_by=(lambda a, b: a < b)):
	def insert_item(m, item0):
		for i, item in enumerate(m):
			if sort_by(item0, item):
				m.insert(i, item0)
				return
		m.append(item0)

	if len(l) <= 1:
		return l

	sorted_list = []
	for item in l:
		insert_item(sorted_list, item)
	return sorted_list

Should be 'm', instead of 'l' for lines 9 and 10.