Python-сообщество

import os
# sample data
template = '/home/pooh/tmp/1'
all_trains = [('1_Chief', 'Trains.USSR_TovarSostav 1', '26000_Chief'),
     ('2_Chief', 'Trains.USSR_FuelCargo 1', '26001_Chief')]
#end sample data
input_filename = os.path.join(template, 'trains_way.mis')
output_filename = os.path.join(template, 'mds.mis')
trains_dict = {k: v for k, _, v in all_trains}
in_seq = False
with open(input_filename) as inf:
    with open(output_filename, 'w') as outf:
        for line in inf:           
            if line.startswith('['):                
                train = trains_dict.get(line.strip()[1:-6], None) # delete '[' and  '_Road]' from line for key
                if train:
                    outf.write('[%s_Road]\n' % train)
                    in_seq = True
                else:
                    in_seq = False
            elif in_seq:                
                outf.write(line)

with open(input_filename) as inf:
   
    with open(output_filename, 'w') as outf:
        for line in inf:           
   
            if line.startswith('['):        
           
                train = trains_dict.get(line.strip()[1:-6], None) # delete '[' and  '_Road]' from line for key
                if train:
                    outf.write('[%s_Road]\n' % train)
                    in_seq = True
                else:
   
                    in_seq = False
            elif in_seq:                
                outf.write(line)

line.strip()[1:-6]

with open(input_filename) as inf:
    with open(output_filename, 'w') as outf:

from contextlib import nested

with A() as a, B() as b:
    suite