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。
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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