python随机数分布random均匀分布实例
因为概率问题,所以需要测试一下python的随机数分布。到底是平均(均匀)分布,还是正态(高斯)分布。
测试代码如下:
#! /usr/bin/env python #coding=utf-8 # ================================= # Describe : 测试random随机数分布 # D&P Author By: 常成功 # Create Date: 2017/10/07 # Modify Date: 2017/10/20 # (C) 2012-2017 All rights reserved # ================================= import random import time def test_rnd(): st_tm = time.time() j = 0 num = 0 the_list = [1, 2, 3, 4] # 计数字典 temp_dic = {1: 0, 2: 0, 3: 0, 4: 0} while 1: x = random.choice(the_list) temp_dic[x] += 1 j += 1 # 跑一千万次 if j >= 10000000: break ed_tm = time.time() print "Test random.choice()---------------------------:" print "loop num: ", j print "take time: ", ed_tm-st_tm print "temp_dic :", temp_dic print "Test random.randint()---------------------------:" st_tm = time.time() j = 0 num = 0 # 计数字典 temp_dic = {1: 0, 2: 0, 3: 0, 4: 0} while 1: x = random.randint(1, 4) temp_dic[x] += 1 j += 1 # 跑一千万次 if j >= 10000000: break ed_tm = time.time() print "loop num: ", j print "take time: ", ed_tm-st_tm print "temp_dic :", temp_dic if __name__ == '__main__': test_rnd()
测试结果:
Test random.choice()---------------------------: loop num: 10000000 take time: 5.86599993706 temp_dic : {1: 2501333, 2: 2500117, 3: 2499406, 4: 2499144} Test random.randint()---------------------------: loop num: 10000000 take time: 12.493999958 temp_dic : {1: 2497732, 2: 2501411, 3: 2499372, 4: 2501485}
结果说明:
平均(均匀)分布。
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