diff --git a/CMD 安装 matplotlib 步骤 b/CMD 安装 matplotlib 步骤
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+pip install matplotlib -i https://pypi.tuna.tsinghua.edu.cn/simple
+常见报错解决：提示 pip 不是内部命令
+换成这条命令再运行：
+py -m pip install matplotlib -i https://pypi.tuna.tsinghua.edu.cn/simple
+爬虫需要的库一并安装
+pip install requests beautifulsoup4 -i https://pypi.tuna.tsinghua.edu.cn/simple