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                [TOC] 程序中有很多地方需要用到隨機字符,比如登錄網站的隨機驗證碼,通過random模塊可以很容易生成隨機字符串 ## 常見用法舉例 ### andrange和randint隨機返回整數 * 語法 `randrange(self, start, stop=None, step=1, _int=int)` `randint(self, a, b)` * 舉例 ``` >>> random.randrange(1,10) 3 #返回1-10之間的一個隨機數,不包括10 >>> random.randint(1,10) 4 #返回1-10之間的一個隨機數,包括10 >>> random.randrange(0, 100, 2) 96 #步長為2返回隨機數 ``` ### random隨機返回浮點數 ``` >>> random.random() 0.7618650194887417 >>> random.random() 0.8179668589356077 ``` ### choice隨機返回指定集合中的單個字符串 ``` >>> random.choice('123abc#@!') '!' >>> random.choice('123abc#@!') 'b' >>> random.choice(['石頭','剪刀','布']) '剪刀' ``` ### sample隨機返回集合中的指定數量字符 ``` >>> random.sample('123abc#@!',2) ['b', '1'] >>> random.sample('123abc#@!',2) ['2', 'a'] ``` ### 配合sting模塊生成隨機字符串 random模塊沒有辦法生成隨機的字符串,不過可以配合sting模塊實現,方法如下: ``` >>> import string >>> string.ascii_letters 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' >>> string.digits '0123456789' >>> random.sample(string.ascii_letters+string.digits,6) ['q', 'X', 'P', 'm', 'b', '7'] >>> ''.join(random.sample(string.ascii_letters+string.digits,6)) 'HMfwXR' ``` ### shuffle將現有列表隨機排列 ``` >>> li=[9,8,7,1,2,3,'a','b','c'] >>> random.shuffle(li) >>> li [2, 7, 'b', 1, 'c', 'a', 9, 3, 8] ```
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