Python 字符串 isalnum() 方法
定义和用法
如果所有字符都是字母数字，则 isalnum() 方法返回 True，这意味着字母 (a-z) 和数字 (0-9)。
非字母数字字符示例： (空格)!#%&? 等等。
语法
string.isalnum()
参数值
无参数。
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