Python Change Order of Lines

reorder-lines.py

import os

for filename in os.listdir("."):
	if(filename != "re.py"):
		with open(filename, "r") as infile:
		    lines = [line for line in infile] # Read all input lines into a list

		ordering = [0,1,2,3,4,5,6,7]#change this
		with open(filename, "w") as outfile:
		    for idx in ordering: # Write output lines in the desired order.
		        outfile.write(lines[idx])