注意，三重引号可以轻松地处理多行 XML 文档。

Notice that the triple quotes handle the multiline XML document with ease.

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另外，字符串可以用一对三重引号”””或'''来标识。

Or, strings can be surrounded in a pair of matching triple-quotes: """ or '.

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使用单引号或三重引号的字符串前面可以加一个字母“ r ”以表示Python不应该解释规则表达式特殊字符。

Both single-quoted or triple-quoted strings may be preceded by the letter "r" to indicate that regular expression special characters should not be interpreted by Python. For example.

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