python集合常见运算案例解析

 import random import time def RandomNumbers(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 = [] n = 0 while True: element = random.randint(start, end) if element not in data: data.append(element) n += 1 if n == number - 1: break return data 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: data.add(random.randint(start, end)) if len(data) == number: break return data start = time.time() for i in range(1000): RandomNumbers(1000, 1, 10000) print('Time used:', time.time()-start) start = time.time() for i in range(1000): RandomNumbers1(1000, 1, 10000) print('Time used1:', time.time()-start) start = time.time() for i in range(1000): RandomNumbers2(1000, 1, 10000) print('Time used2:', time.time()-start)