import os
oldFileName = "test.txt"
newFileName = "test.old"
#Old Listing
for file in os.listdir("c:/"):
if file.startswith("output"):
print file
#Remove file if the new name already exists
if os.access(newFileName, os.X_OK):
print "Removing " + newFileName
os.remove(newFileName)
#Rename the file
os.rename(oldFileName, newFileName)
#New Listing
for file in os.listdir("c:/"):
if file.startswith("output"):
print file