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python随机数分布random均匀分布实例

yipeiwu_com6年前 (2020-03-06)Python基础

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}