Replace or delete a line in files

replace_or_delete_line.py

# Replace a line

import os

files = [f for f in os.listdir('.') if f.endswith('md')]

for file in files:
    with open(file, 'r') as f:
        lines = f.readlines()
    with open(file, 'w') as f:
        for line in lines:
            if 'author: John Baltis' in line:
                f.write('author: Bas Nijholt\n')
            else:
                f.write(line)

# Delete a line
import os

files = [f for f in os.listdir('.') if f.endswith('md')]

for file in files:
    with open(file, 'r') as f:
        lines = f.readlines()
    with open(file, 'w') as f:
        for line in lines:
            if 'id: ' not in line:
                f.write(line)