Please help explain this code in Python

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How do I list all files of a directory? 31 answers

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我会给它一个镜头，希望这有助于。

import os 
#   vvvvvvv directory name of the current position in the walk (eg, /var then /var/log then /var/log/apache2, etc)
#            vvvvvvvv list (array) of sub directories
#                      vvvvvvvvv list (array) of files
for dirname, dirnames, filenames in os.walk('# I will have a directory here'): # loops through the directories list
    for filename in filenames: #loops through the files returned by the previous for loop
      print (os.path.join(dirname, filename)) # join the directory and the filename returning something like /var/log/dmesg.log

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