Python implementation of the method to batch change the file extension of files in a specified directory

This article describes a method to batch change the file extension of files in a specified directory using Python. Share it with everyone for reference, as follows:

# Encoding=utf-8
# Author: walker
# Date: 2013-12-06
# Function: Deeply traverse specified directory and change specified extension
import os
import os.path
# Read in specified directory and convert to absolute path
rootdir = raw_input('root dir:\n')
rootdir = os.path.abspath(rootdir)
print('absolute path:\n' + rootdir)
# Read in 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 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:The above function can also be implemented with one shell command

# Replace the suffix .ini with .txt
# The path name can be a relative path or an absolute path
find path name | rename 's/\.ini$/\.txt/'

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

PS2:scandir compatible code.

# 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 the content described in this article will be helpful to everyone in Python program design.

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