Python implements the method of batch replacement of file extensions under the specified directory

The example in this article describes how Python implements bulk replacement of file extensions in a specified directory. I will share it with you for your reference as follows:

#encoding=utf-8
#author: walker
#date: 2013-12-06
#function:  To deeply traverse the specified directory, change the specified extension 
import os
import os.path
# Reads into the specified directory and converts to the absolute path 
rootdir = raw_input('root dir:\n')
rootdir = os.path.abspath(rootdir)
print('absolute path:\n' + rootdir)
# Read in the original extension and standardize 
old_ext = raw_input('old extension:\n')
old_ext = old_ext.strip()
if old_ext[0] != '.':
  old_ext = '.' + old_ext
# Read in the new extension and standardize 
new_ext = raw_input('new extension:\n')
new_ext = new_ext.strip()
if new_ext[0] != '.':
  new_ext = '.' + new_ext
for parent, dirnames, filenames in os.walk(rootdir):
  for filename in filenames:
    pathfile = os.path.join(parent, filename)
    if pathfile.endswith(old_ext):
      new_pathfile = os.path.splitext(pathfile)[0] + new_ext
      print('=======================================================')
      print(pathfile)
      print('-------------------------------------------------------')
      print(new_pathfile)
      print('=======================================================')
      os.rename(pathfile, new_pathfile)

PS: one shell command is also available

# The suffix .ini Switch to .txt
# Path names can be relative or absolute 
find  The path name  | rename 's/\.ini$/\.txt/'

Note that the rename command above is the rename command of the perl version.

PS2: compatible code for scandir.

# Use the built-in version of scandir/walk if possible, otherwise
# use the scandir module version
try:
  from os import scandir, walk  #python3.5+
except ImportError:
  from scandir import scandir, walk #python3.4-

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I hope this article is helpful for you to design Python program.