ERROR: Could not build wheels fo

ERROR: Could not build wheels for multidict which use PEP 517 and cannot be installed directly
解决方法

###升级pip，命令如下：
pip install --upgrade pip
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##然后再次
pip3 install --no-cache-dir -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com -r requirements.txt