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Remove file if the new name already exists

import os oldFileName = "test.txt" newFileName = "test.old" for file in os.listdir("c:/"):     if file.startswith("output"):         print file if os.access(newFileName, os.X_OK):     print "Removing " + newFileName     os.remove(newFileName) os.rename(oldFileName, newFileName) for file in os.listdir("c:/"):     if file.startswith("output"):         print file