The only way for a constructor to handle an exception from a constructor initializer is to write the constructor as a function try block.

构造函数要处理来自构造函数初始化式的异常，唯一的方法是将构造函数编写为函数测试块。

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SafeHandleRequest calls the function that is the second argument inside a try and except block.

_safeHandleRequest调用的函数是try和except块内部的第二个参数。

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SafeHandleRequest calls the function that is the second argument inside a try and except block.

_safeHandleRequest调用的函数是try和except块内部的第二个参数。

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