python——pip版本過低報錯

WARNING: You are using pip version 19.2.3, however version 19.3.1 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command. 由於很久之前用過一週時間爬蟲，屬於小白入門層級。最近有機會，再整一下。

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