pip安装spyder出错Preparing wheel metadata ... error
解决办法：
先安装wheel
pip install wheel -i https://pypi.tuna.tsinghua.edu.cn/simple
然后再安装spyder
出错ERROR: After October 2020 you may experience errors when installing or updating packages. This is because pip will change the way that it resolves dependency conflicts.
解决办法：在安装spyder的命令后加--use-feature=2020-resolver
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