A scriptlet for apply template to multiple files

apply.py

from pathlib import Path
from datetime import datetime

files = [f for f in Path().iterdir() if f.suffix == '.md']
files

template = Path('template').read_text()
template

def apply(source, template):
    output = template

    dt = datetime.fromtimestamp(source.stat().st_mtime).strftime('%Y%m%d%H%M')
    output = template.replace('[[DATETIME]]', dt)

    txt = source.read_text()
    output = output.replace('[[CONTENTS]]', txt)

    return output
  
  
for f in files:
    output = apply(f, template)
    Path('output/' + f.name).write_text(output)