Python：循环内仅打印一次

我有一个要从相机捕获视频的代码.我想使用Python的Logging库在外壳上获取消息或将其导出到文本文件.

这是我的代码的一部分,在while循环中,我要打印成功打开的Camera

import numpy as np
import cv2
import logging as log

cap = cv2.VideoCapture('5.mpg')

while True:

    ret, image = cap.read()

    if ret == True:
        log.warning('Camera Opened Successfully')

    gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
    clahe = cv2.createCLAHE(clipLimit = 15.0, tileGridSize=(8,8))
    gray1 = clahe.apply(gray)

但是我得到的是：

直到我终止正在运行的脚本.关于如何使其仅打印一次的任何想法.

解决方法:

import numpy as np
import cv2
import logging as log

cap = cv2.VideoCapture('5.mpg')
hasOpened = False

while True:

    ret, image = cap.read()

    if ret and not hasOpened:
        log.warning('Camera Opened Successfully')
        hasOpened = True

如果要在打印后跳出循环,请遵循Matt的回答.此选项将继续循环,仅打印一次.

标签：opencv3-0,loops,python
来源： https://codeday.me/bug/20191118/2028577.html