基于ubuntu16.04，本人在更换一次系统下载源后，误操作进行了内核升级。出现NVIDIA-SMI has failed because it couldn‘t communicate with the NVIDIA driver 的报错

@[TOC](opencv videocapture() 读取视频cap.isOpened 输出总是false)opencv videocapture读取视频cap.isOpened 输出总是false应该是视频本身的问题，换个视频就可以了

基于ubuntu16.04，本人在更换一次系统下载源后，误操作进行了内核升级。出现NVIDIA-SMI has failed because it couldn‘t communicate with the NVIDIA driver 的报错

【代码】python中np.array的shape(2,)与shape(1 ,2)的运算细节。

keras运行过程出现如下错误：original_keras_version = f.attrs['keras_version'].decode('utf8')AttributeError: 'str' object has no attribute 'decode'方法：卸载重装不同版本pip uninstall h5pypip install h5py==2.10.0

环境Ubuntu16.04 。安装的opencv，python3.7cap.isOpened 输出false，出错原因在cv2.VideoCapture(filename)处。解决方法，运行：pip install opencv-contrib-python

【代码】Python中sys.stdout.write和sys.stdout.flush的用法及说明。