问题：
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Is it possible to upgrade all Python packages at one time with pip ?是否可以使用pip一次升级所有 Python 包？
Note : that there is a feature request for this on the official issue tracker.注意：在官方问题跟踪器上有一个功能请求。
解决方案：
参考一： https://en.stackoom.com/question/BPbC参考二： https://stackoom.com/question/BPbC