```import numpy as npimport cv2 #shape (480, 640, 3) Numpy ndarray matri...

```import numpy as npimport matplotlib.pyplot as plt arr=np.array([[0, 0...

http psot request has no content-tent and body is null

For completeness, from version 2.2 you can return dynamic content like t...

frontend wwwbind :80default_backend webserverserrorfiles myerrorshttp-re...

range(stop) 0 stop-1range(start, stop)：start stop-1range(b,e,step) start...

```a @ bdot(a, b) a @= ba = dot(a, b) >>> a = [1,2,3]>>> b = [4,5,6]>>> ...

2^1色位图:2bit2^4色位图: 4bit2^8色位图: 8bit24位位图：24bit = RGB,R:8bit/G:8bit/B:8bit