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fix(c02_p15): typo #374

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fix(c02_p15): typo #374

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4 changes: 2 additions & 2 deletions source/c02/p15_interpolating_variables_in_strings.rst
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Expand Up @@ -121,10 +121,10 @@ Python并没有对在字符串中简单替换变量值提供直接的支持。
>>>

然而， ``format()`` 和 ``format_map()`` 相比较上面这些方案而已更加先进，因此应该被优先选择。
使用 ``format()`` 方法还有一个好处就是你可以获得对字符串格式化的所有支持(对齐，填充，数字格式化等待)，
使用 ``format()`` 方法还有一个好处就是你可以获得对字符串格式化的所有支持(对齐，填充，数字格式化等等)，
而这些特性是使用像模板字符串之类的方案不可能获得的。

本机还部分介绍了一些高级特性。映射或者字典类中鲜为人知的 ``__missing__()`` 方法可以让你定义如何处理缺失的值。
本节还部分介绍了一些高级特性。映射或者字典类中鲜为人知的 ``__missing__()`` 方法可以让你定义如何处理缺失的值。
在 ``SafeSub`` 类中，这个方法被定义为对缺失的值返回一个占位符。
你可以发现缺失的值会出现在结果字符串中(在调试的时候可能很有用)，而不是产生一个 ``KeyError`` 异常。

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