title: Python : Read all files in directory to watch inside while loop
body: <p>I am working on a python script, where I will be passing a directory, and I need to get all log-files from it. Currently, I have a small script which watches for any changes to these files and then processes that information.</p>
  <p>It's working good, but it's just for a single file, and hardcoded file value. How can I pass a directory to it, and still watch all the files. My confusion is since I am working on these files in a while loop which should always stay running, how can I do that for n number of files inside a directory?</p>
  <p>Current code :</p>
  <pre><code>import time
  
  f = open('/var/log/nginx/access.log', 'r')
  while True:
      line = ''
      while len(line) == 0 or line[-1] != '\n':
          tail = f.readline()
          if tail == '':
              time.sleep(0.1)          # avoid busy waiting
              continue
          line += tail
          print(line)
          _process_line(line)
  </code></pre>
  <p>Question was already tagged for duplicate, but the requirement is to get changes line by line from all files inside directory. Other questions cover single file, which is already working.</p>