Python从序列中选择k个不重复元素

import random
import time
def RandomNumbers1(number, start, end):
 '''使用列表来生成number个介于start和end之间的不重复随机数'''
    data = []
 while True:
        element = random.randint(start, end)
 if element not in data:
            data.append(element)
 if len(data) == number:
  break
 return data
def RandomNumbers2(number, start, end):
 '''使用集合来生成number个介于start和end之间的不重复随机数'''
    data = set()
 while True:
        element = random.randint(start, end)
        data.add(element)
 if len(data) == number:
 return data
start = time.time()
for i in range(10000):
    d1 = RandomNumbers1(500, 1, 10000)
print('Time used:', time.time()-start)
start = time.time()
for i in range(10000):
    d2 = RandomNumbers2(500, 1, 10000)
print('Time used:', time.time()-start)

Time used: 41.77738952636719
Time used: 13.330762386322021

>>> import random
>>> random.sample(range(1000), 20)
[61, 538, 873, 815, 708, 609, 995, 64, 7, 719, 922, 859, 807, 464, 789, 651, 31, 702, 504, 25]