當pip失敗的時候如何手動下載安裝python包

1、爲什麼pip會失敗？ （1）需要的包找不到正確版本 ERROR: Could not find a version that satisfies the requirement map==1.2.0 (from versions: none) （2）所用的pip版本不正確 Make sure that you use the correct version of ‘pip’ installed

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