At present, the quantity of well-known concrete mixing plant enterprises in our country is small, the value is not high,

1.https:pypi 2.https:pypi.tuna.tsinghua.edusimple 使用以下命令快速下载安装，解决pip安装慢的问题： pip install -i

windows7 pip *.whl is not a supported wheel on this platform解决方案 在windows7中使用pip安装whl包时可能会出现平台不支持的问题，明明电脑是64