python3基础06（随机数的使用）

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import os
import random
import string

la=[0,1,2,3,4,5,6,7,8,9]

print(random.seed(10))
print(random.getrandbits(3))

#16位小数
re=print(random.random())

# 15位小数
re=print(random.uniform(0,9))

re=print(random.randrange(3))
re=print(random.randrange(0,9,1))
re=print(random.randint(0,9))

#随机选择一位元素 非空序列
re=print(random.choice(la))

re=print(random.choices(la,weights=None,cum_weights=2,k=3))

#生成k=3个元素组成的列表，根据权重去生成
print(random.choices([3,6,9], [2, 5, 7], k=3))

#
re=print(random.shuffle(['a','ff','cc','test']))

#生成新的序列 不重复 k为 元素个数
re=print(random.sample(la,k=5))

#根据生成的字符次数情况算概率
trial = lambda: random.choices('HT', cum_weights=(0.60, 1.00), k=7).count('H') >= 5
re=sum(trial() for i in range(10000)) / 10000
print(re)

trial = lambda : 2500 <= sorted(random.choices(range(10000), k=5))[2]  < 7500
re=sum(trial() for i in range(10000)) / 10000
print(re)

#生成随机数包含大写字母+数字
checkcode = ''
for i in range(4):
    current = random.randrange(0,4)
    if current != i:
        temp = chr(random.randint(65,90))
    else:
        temp = random.randint(0,9)
    checkcode += str(temp)
print(checkcode)

#指定生成位数的随机数 包含字母和数字
def gen_random_string(length):
    # 数字的个数随机产生
    num_of_numeric = random.randint(1,length-1)

    # 剩下的都是字母
    num_of_letter = length - num_of_numeric

    # 随机生成数字
    numerics = [random.choice(string.digits) for i in range(num_of_numeric)]

    # 随机生成字母
    letters = [random.choice(string.ascii_letters) for i in range(num_of_letter)]

    # 结合两者
    all_chars = numerics + letters

    # 洗牌 对序列随机排序
    random.shuffle(all_chars)

    # 生成最终字符串
    result = ''.join([i for i in all_chars])
    # result = ''.join(all_chars)

    return result

if __name__ == '__main__':
    print(gen_random_string(4))