ERROR: Could not install packages due to an EnvironmentError安装包时出现错误

1、错误出现的缘由，因为要学习机器学习，在numpy和scikit-learn已经安装的状况下，要用到matplotlib，安装matplotlib时 出现的错误 2、错误以下图所示 ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: ‘d:\xxx\a

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