def METHOD_NAME(self, subfolder):
    if not os.path.exists(subfolder):
        os.makedirs(subfolder)
    for item in os.listdir(self.output_folder):
        if os.path.isfile(os.path.join(self.output_folder, item)):
            shutil.copy(os.path.join(self.output_folder, item), os.path.join(subfolder, item))