随机数模块 random模块（1）

1、取随机小数

import random
print(random.random())         # (0,1)
print(random.uniform(2,3))      # (n,m)

2、取随机整数

import random
print(random.randint(1,2))       # [1,2]
print(random.randrange(1,2))     # [1,2)
print(random.randrange(1,100,2))     # 取随机奇数

3、从一个类表中随机抽取

import random
lst = [1,2,3,4,5,('a','b'),'ss','dd']
ret = random.choice(lst)
print(ret)

3.2在range中使用

import random
ret1 = random.choice(range(100))
print(ret1)

3.3在列表中取3个值

import random
lst = [1,2,3,4,5,('a','b'),'ss','dd']
ret11= random.sample(lst,3)   # sample
print(ret11)

4、乱序：元素随机排序

import random
lst = [1,2,3,4,5,('a','b'),'ss','dd']
random.shuffle(lst)
print(lst)  # ['dd', 3, 1, 4, 5, ('a', 'b'), 2, 'ss']

5、random的应用   验证码

import random
def get_code(n=6):
    code = ''
    for i in range(n):
        num = random.randint(0,9)
        code += str(num)
    return code
ret = get_code()
print(ret)

6、random的应用   带大、小写字母和数字的验证码

import random
def get_code(n):
    code = ''
    for i in range(n):
        num = str(random.randint(0,9))
        alpha_upper = chr(random.randint(65,90))
        alpha_lower = chr(random.randint(97,122))
        c = random.choice([num ,alpha_upper,alpha_lower])
        code +=c
    return code
ret = get_code(6)
print(ret)