Suppose you have a binary system that only one star is visible and the other one is invisible and the one star shows you three clear absorption lines.
假设有一个双星系统,只能看见一颗恒星,另一个看不见,一个恒星,有三条清晰吸收线。
If your system already contains such a file, leave most options as they are, but ensure that the file has the three final lines shown in Listing 2, beginning with [swat].
如果您的系统已经包含这样一个文件，那么请保持大多数选项不变，但要确保文件的最后三行如清单2所示，都是以[swat]开头。
The first three lines of code check out the latest version of sqlalchemy and add it as a package to the Python installation on your local system.
前三行代码检查最新版本的 sqlalchemy，并将它作为包添加到您本地系统的 Python 安装中。
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