安装sklearn报错 ERROR: Could not install packages due to an EnvironmentError

ERROR: Could not install packages due to an EnvironmentError: [Errno 2] No such file or directory: 'C:\\Users\\10647\\AppData\\Local\\Packages\\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\\LocalCache\\local-packages\\Python38\\site-packages\\sklearn\\datasets\\tests\\data\\openml\\292\\api-v1-json-data-list-data_name-australian-limit-2-data_version-1-status-deactivated.json.gz' 

是因为路径太长了，要去注册表里把文件长度加长。

 

解决方法：

cmd运行“regedit” 打开注册表编辑

找到 Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\FileSystem 

改变 LongPathsEnabled property of that key 然后设置为 1.

重新安装sklearn   pip install sklearn