以下代码为在Python3环境下利用OpenCV 抓取摄像头的实时图像, 通过OpenCV的 calHist函数计算直方图, 并显示在3个不同窗口中. import cv2 import numpy as np from matplotlib import pyplot as plt import time cap = cv2.VideoCapture(0) for i in range(0, 19): print(cap.get(i)) while(1): ret, fram…
注:本文来源于< mysql5.7设置简单密码报错ERROR 1819 (HY000): Your password does not satisfy the current policy requirements > [问题] 有时候,只是为了自己测试,不想密码设置得那么复杂,譬如只想设置root的密码为123456. SET PASSWORD FOR 'root'@'localhost' = PASSWORD('123456'); 但是会报错: mysql> SET PASSWOR…