import datetime
import random
import uuid

for i in range(0, 1):
 nowTime = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
 randomNum = random.randint(0, 100)
 uniqueNum = str(nowTime) + str(randomNum)
 print(uniqueNum)
 print(uuid.uuid1())

c = [1, 2, 5]
print(max(c))
# 方法一
Num_begin = '0001'
Num_Lost = ['0008', '0005', '0007']
if len(Num_Lost) == 0:
 Num_begin = int(Num_begin) + 1
 if len(str(Num_begin)) < 5:
 s = str(Num_begin).zfill(5)
 print(s)
 else:
 print(Num_begin)
else:
 print(min(Num_Lost))
for i in range(1, 5):
 print(i)
# 方法二
num = []
for i in range(1, 999999):
 num.append(random.randint(1, 999999))
num.sort(reverse=False)
a = 0
d1 = datetime.datetime.now()
n = []
for i in range(1, len(num)):
 if num[i] - num[i - 1] != 1:
 for j in range(num[i - 1] + 1, num[i]):
 n.append(j)
d2 = datetime.datetime.now()
print('缺号：%s' % str(n))
print('缺号数:%s' % len(n))
print('执行时间:%s' % (d2-d1))