First, much of the work done by a concrete class is specified in the docstrings of methods.
首先，具体类所完成的大部分工作都在方法的文档字符串(docstring)中指定。
When they occur inside of docstrings inside of Python source code, like in the second example, they are called doctests.
当它们出现在python源代码中的docstring中时(比如第二个示例)，它们就被称为doctest。
The docstrings processed by doctest can contain tracebacks within them, but a better approach to special cases is to utilize unittest.
由doctest 处理的文档字符串可能会在其内部包含回溯（traceback）,但是在特别的情况下，更好的方法是使用unittest 。
The docstrings processed by doctest can contain tracebacks within them, but a better approach to special cases is to utilize unittest.
由doctest 处理的文档字符串可能会在其内部包含回溯（traceback）,但是在特别的情况下，更好的方法是使用unittest 。
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