import re from subprocess import check_output def get_new_toc(): new_toc = check_output( 'node_modules/.bin/markdown-toc README.md', shell=True ).decode('utf-8') pattern = ['', '', new_toc, '', ''] return '\n'.join(pattern) def get_readme(): with open('README.md', 'r') as f: return f.read() def save_readme(readme): with open('README.md', 'w') as f: return f.write(readme) def replace_toc(): readme = get_readme() new_toc = get_new_toc() regex = '(.|\n)+' new_readme = re.sub(regex, new_toc, readme) save_readme(new_readme) print('TOC updated ...') def main(): return replace_toc() if __name__ == '__main__': main()