isolating part of elemnnt in a list

[Yoriz]

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This code will create a single file from the .dat files in the folder

import glob

def yield_dat_file(file_name):
    with open(file_name) as file_obj:
        next(file_obj)
        for line in file_obj:
            frame, action = line.split()
            file_number, _ = file_name.split('.')
            yield int(file_number), int(frame), action

def yield_all_dat_files():
    dat_file_names = glob.glob('*.dat')
    for file_name in sorted(dat_file_names):
        for dat_row in yield_dat_file(file_name):
            yield dat_row

def create_single_dat():
    with open('FINAL.dat', 'w') as file_obj:
        file_obj.write('MohoSwitch1\n')
        for file_number, frame, action in yield_all_dat_files():
            file_obj.write('{} {}\n'.format(file_number + frame, action))

create_single_dat()

Final.dat

MohoSwitch1
1 FV
2 L
235 AI
237 etc
565 rest
577 E