# Simply had a lot of files I needed to rename
import os

# Get the current directory
path =  os.getcwd()
# Gather all file names
filenames = os.listdir(path)

# Loop through change all file endings from .htm to .xhtml.
# changing to lowercase for readability, personal preference
for filename in filenames:
    os.rename(filename, filename.replace(".htm",".xhtml").lower())