conda安装虚拟环境时报错：If your current network has https://www.anaconda.com blocked, please filea support request with your network engineering team.‘https://repo.anaconda.com/pkgs/main/linux-64’解决方法：con...

找到labelImg.py文件所在的路径，然后在该路径下打开终端，输入：python labelImg.py

如何以我通常使用列表(List)的方式使用Numpy数组或矩阵? 我想创建一个空的数组(或矩阵)，然后每次添加一列(或行)到这个数组(或矩阵)。目前能想到的方法是：mat = Nonefor col in columns:if mat is None:mat = colelse:mat = hstack((mat, col))而如果它是一个列表，我会这样做：list = []f...

pip3 install opencv-python时，报以上错误。改成pip3 install --default-timeout=1000 IPthon后安装成功。用conda 安装opencv:conda install opencv