mengmengxyz questions

• how to find minimum/maximum values axis by axis in numpy array
• How to traverse a list in reverse order in Python (index-style: '... in range(...)' only)
• how to make a new numpy array same size as a given array and fill it with a scalar value
• how to extract x,y coordinates from OpenCV "cv2.keypoint" object?
• How do I extract a sub-array from a numpy 2d array? [duplicate]

mengmengxyz answers