python随机数分布random均匀分布

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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。