flask_watch_file.py

__main__.py

extra_dirs = ['./']
extra_files = extra_dirs[:]
for extra_dir in extra_dirs:
    for dirname, dirs, files in os.walk(extra_dir):
        for filename in files:
            filename = os.path.join(dirname, filename)
            if os.path.isfile(filename) and os.path.splitext(filename)[1] in ['.py', '.html', '.js']:
                extra_files.append(filename)

if __name__ == '__main__':
    app.run(debug=True,extra_files=extra_files)