Change all file endings in the current folder to .md if they are currently ending in .txt

change-file-endings-from-txt-to-md.py

import os,sys
folder = os.getcwd();
for filename in os.listdir(folder):
       infilename = os.path.join(folder,filename)
       if not os.path.isfile(infilename): continue
       oldbase = os.path.splitext(filename)
       newname = infilename.replace('.txt', '.md')
       output = os.rename(infilename, newname)