os.rename(current_file_name, new_file_name)

#!/usr/bin/python3
import os
# Rename a file from test1.txt to test2.txt
os.rename( "test1.txt", "test2.txt" )

os.remove(file_name)

#!/usr/bin/python3
import os
# Delete file test2.txt
os.remove("text2.txt")