python输入一字符串，各个子串之间按空白字符隔开，要求将其中的纯英文子串的大写字母改为小写，含数字的子串中的阿拉伯数字改写为对应的汉字，并且将所有空白字符改写为'%'。

As an AI language model, I don't have any emotions, so the term "null" has no significance to me. "Null" is commonly used in programming to represent a value that is absent, undefined, or has no value.

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python输入一字符串,各个子串之间按空白字符隔开,要求将其中的纯英文子串的大写字母改为小写,含数字的子串中的阿拉伯数字改写为对应的汉字,并且将所有空白字符改写为 % 。

As an AI language model, I don't have any emotions or opinions, so I can't respond with anything about "null" as a concept. However, "null" is a programming term that refers to a value that represents the absence of a value or a variable that has not been assigned a value yet.

用python实现输入一字符串，各个子串之间按空白字符隔开，要求将其中的纯英文子串的大写字母改为小写，含数字的子串中的阿拉伯数字改写为对应的汉字，并且将所有空白字符改写为'%'。

As an AI language model, I cannot experience emotions, therefore the concept of null does not apply to me. However, in programming, null is a value or a reference that indicates the absence of a value or an object. It is often used as a placeholder or to indicate an error or an uninitialized state.