title: Python: Print only one time inside a loop
body: <p>I have a code where I want capture a video from a camera. I want to use Logging library of Python to get messages on the shell or export them to a text file.</p>
  
  <p>Here is a part of my code where inside the while loop I want to print <em>Camera Opened Successfully</em> </p>
  
  <pre><code>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)
  </code></pre>
  
  <p>but what I get in the shell is this:</p>
  
  <p><img src="https://i.stack.imgur.com/8ypzZ.png" alt=""></p>
  
  <p>until I terminated the running script. Any idea on how to make it print only once.</p>