python3.8 match

回答: 在Python 3.8中，引入了一种新的语法来进行正则表达式的匹配，即使用:=来声明并赋值变量。这个语法可以避免重复调用，使代码更加简洁。在re模块中，可以使用re.match函数来尝试从字符串的起始位置匹配一个模式。如果匹配成功，就返回一个匹配对象；如果匹配失败，就返回None。举个例子，可以使用re.match来匹配字符串中是否包含某个模式。比如，可以使用re.match(r"python", "I love python!")来判断字符串是否以"python"开头。<em>1</em><em>2</em><em>3</em>
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