Python rename files

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import os
import os.path

# point to the target directory
dirpath = 'F:\\a\\'

# loop begin
for file in os.listdir(dirpath):
  # if it's a file
	if os.path.isfile(os.path.join(dirpath, file)) == True:
		newname = '[BOMB.tv]' + file
    #rename it
		os.rename(os.path.join(dirpath, file),os.path.join(dirpath, newname))
		print (file,'ok')
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import os
import sys

dirpath = 'F:\\a\\'

#three parameters: parent directory, all directory name, all file names
for parent,dirnames,filenames in os.walk(dirpath):
	for filename in filenames:
    # format output
		old = "%s/%s" %(dirpath, filename)
		new = "%s/%s" %(dirpath, "[BOMB.tv]" + filename)
		os.rename(old, new)

	# output directory info
	for dirname in dirnames:
		print ("parent is:" + parent)
		print ("dirname is:" + dirname)

	# output file info
	for filename in filenames:
		print ("parent is:" + parent)
		print ("filename is:" + filename)
		print ("the full name of the file is:" + os.path.join(parent,filename))