3、求一个无序列表中最大长度的连续自然数

 一个列表中全是自然数，是无序的，计算这个列表中最大长度的连续自然数。比如[1,5,7,9,12,17,,6,6]，返回结果为 [5,6,7]

def get_longest_num(list1):
	longest_num = []
	long_tmp = []
	flag = True
	longth = 1
	last_longest = 0
	list1 = sorted(list1)
	for j, i in enumerate(list1):
		
		if(flag):
			num_start = i
			flag = False

		if(i == list1[j-1] and j!=len(list1)-1):
			continue
		elif(list1[j-1] == i-1):
			long_tmp.append(i)
		if(list1[j-1] != i-1 or j == len(list1)-1):
			if(longth>last_longest):
				longest_num = []
				longest_num.append(long_tmp)
			elif(longth==last_longest and longth != 0):
				longest_num.append(long_tmp)
			
			long_tmp = []
			long_tmp.append(i)
			last_longest = longth if(longth>last_longest) else last_longest
			longth = 1
			num_start = i
		
		longth = longth + 1
	print(longest_num)

get_longest_num([0,1,2,5,6,6,6,7,7])