Скопировать текст из файла в несколько других файлов

with open('command.txt', 'r') as infile:
    lst = infile.read().split('\n')
 
 
indexes = [i for i,x in enumerate(lst) if x == 'R1#']
 
commands = []
 
for x in range(len(indexes)):
    if x == len(indexes) - 1:
        commands.append(lst[indexes[x]:])
    else:
        commands.append(lst[indexes[x]:indexes[x+1]])
 
for x in commands:
    namefile = 'файл_с_коммандой' + x[1][-1] + '.txt'
    with open(namefile, 'w') as outfile:
        outfile.write("\n".join(x[2:]))

import re
 
with open('src.txt', 'r') as infile:
    lst = infile.read().split('\n')
 
lst = lst[6:]
 
indexes = [i for i,x in enumerate(lst) if re.search('^R\d#\w+', x) != None]
 
commands = []
 
for x in range(len(indexes)):
    if x == len(indexes) - 1:
        commands.append(lst[indexes[x]:])
    else:
        commands.append(lst[indexes[x]:indexes[x+1]])
 
for x in commands:
    print(x)

>>> doc ='''R1#
R1#command1
здесь
вывод
команды1
куча строк
 
R1#
R1#command2
здесь
вывод
команды2
куча строк
R1#
R1#command3
'''
>>> l  = [i for i in re.split(r'R1',doc) if i.startswith('#command')]
>>> l
['#command1\nздесь\nвывод\nкоманды1\nкуча строк\n\n', '#command2\nздесь\nвывод\nкоманды2\nкуча строк\n', '#command3\n']
>>>

import os
 
def save_file(count, subject, body, path_dir):
    if count > 0:
        file_name = '{0:03}{1}.txt'.format(count, subject)
        path = os.path.join(path_dir, file_name)
        print(path)
        with open(path, 'w+') as fp:
            fp.write('\n'.join(body))
 
def process_file(path_input, path_dir):
    count = 0
    subject = None
    body = []
    with open(path_input) as fp:
        line = fp.readline().strip()
        while line:
            if line == 'R3#':
                save_file(count - 1, subject, body, path_dir)
                count += 1
            elif line.startswith('R3#'):
                subject = line[3:]
                body = []
            else:
                body.append(line)
            line = fp.readline().strip()    
        save_file(count - 1, subject, body, path_dir)
     
process_file('c:\Temp\INPUT.TXT', 'c:\Temp')