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python-random

  • 2026-02-03 01:50:58
python-random

random是用于生成随机数的,可以利用它随机生成数字或者选择字符串。

  • random.random()
        用于生成一个随机浮点数:range[0.0,1.0)
import randomrandom.random()   #输出 0.5487876445645461
  • random.uniform(a,b)
       用于生成一个指定范围内的随机浮点数,a,b为上下限,只要a!=b,就会生成介于两者之间的一个浮点数,若a=b,则生成的浮点数就是a
import randomrandom.uniform(10,20) #输出 15.999997038152358random.uniform(20,10) #输出 12.718038067741021random.uniform(10,10) #输出 10.0
  • random.randint(a,b)
       用于生成一个指定范围内的整数,a为下限,b为上限,生成的随机整数a<=n<=b;若a=b,则n=a;若a>b,报错
import randomrandom.randint(10,20) #输出 12random.randint(10,10) #输出 10random.randint(20,10) #Error
  • random.randrange([start], stop [,step])
      从指定范围内,按指定基数递增的集合中获取一个随机数,基数缺省值为1
import randomrandom.randrange(10,100)       #输出为10100间的任意数random.randrange(10,100,4)     #输出为10100内以4递增的序列[10,14,18,22...]random.choice(range(10,100,4)) #输出在结果上与上一条等效
  • random.choice(sequence)
       从序列中获取一个随机元素,参数sequence表示一个有序类型,并不是一种特定类型,泛指list,tuple,字符串等
import randomrandom.choice(range(10)) #输出0到10内随机整数random.choice(range(10,100,2)) #输出随机值[10,12,14,16...]random.choice("I love python"#输出随机字符I,o,v,p,y...random.choice(("I love python")) #同上random.choice(["I love python"]) #输出“I love python”random.choice("I","love","python"#Errorrandom.choice(("I","love","python")) #输出随机字符串“I”,“love”,“python”random.choice(["I","love","python"]) #输出随机字符串“I”,“love”,“python”
  • random.shuffle(x[,random])
      用于将一个列表中的元素打乱
import randomlist=['I','love','python','very','much']random.shuffle(list)print list     #输出乱序list
  • random.sample(sequence,k)
        从指定序列中随机获取k个元素作为一个片段返回,sample函数不会修改原有序列 
import randoma='123456789'b=[1,2,3,4,5,6,7,8,9]c=['a','b','c','d','e']random.sample(a,3)random.sample(b,3)random.sample(c,3)  #随机取三个元素最为一个片段返回[6,4,3]print aprint bprint c    #a,b,c值不变

随机验证码

import randomdef v_code():    code = ''    for i in range(4):        num = random.randint(09)        Alf = chr(random.randint(6590))   # 大写A-Z        alf = chr(random.randint(97122))  # 小写a-z        add = random.choice([num, Alf, alf])        code += str(add)    return codeprint(v_code())

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  1. CONNECT:[ UseTime:0.000678s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000961s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002511s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001097s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000309s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000606s ]
  8. SELECT * FROM `article` WHERE `id` = 470131 LIMIT 1 [ RunTime:0.005767s ]
  9. UPDATE `article` SET `lasttime` = 1770437830 WHERE `id` = 470131 [ RunTime:0.005269s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000352s ]
  11. SELECT * FROM `article` WHERE `id` < 470131 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002512s ]
  12. SELECT * FROM `article` WHERE `id` > 470131 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.041981s ]
  13. SELECT * FROM `article` WHERE `id` < 470131 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001079s ]
  14. SELECT * FROM `article` WHERE `id` < 470131 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006337s ]
  15. SELECT * FROM `article` WHERE `id` < 470131 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011824s ]
0.148538s