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最近在使用python安装scikit-surprise时，使用命令 pip install scikit-surprise 出现下面错误。Looking in indexes: http://mirrors.aliyun.com/pypi/simple/Collecting scikit-surpriseWARNING: The repository located at mirrors.aliyun.com is not a trusted or secure host and is bein

python绘制三维图用python绘制3维图片，示例为关于公式f(x，y)=(x2+y−11)2+(x+y2−7)2\\f({x，y} )= (x^2+y-11)^2+(x+y^2-7)^2f(x，y)=(x2+y−11)2+(x+y2−7)2如果报错：Unknown projection ‘3d’则必须要加上：from mpl_toolkits.mplot3d import Axes3Dimport matplotlib.pyplot as pltimport numpy as npf