merge two c2d (Carbid Create) files

merge-c2d.py

#!/usr/bin/python3
import json
import argparse

# parse command line arguments
parser = argparse.ArgumentParser()
parser.add_argument('master')
parser.add_argument('file_to_merge')
parser.add_argument('output_file')
args = parser.parse_args()

# read first file
with open(args.master) as f:
    master = json.load(f)

# read file to merge
with open(args.file_to_merge) as f:
    file_to_merge = json.load(f)

# add all items from the second file to the first file, except the document properties
for key, item in file_to_merge.items():
    if (key != 'DOCUMENT_VALUES') and (key in master):
        master[key].extend(item)
            
# save result
with open(args.output_file, 'w') as f:
    json.dump(master, f, indent=4, sort_keys=True)