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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