Output the list of block IDs and quantities from a structure .nbt file.

get_structure_nbt_block_list.py

import sys
# Requires Python-NBT
#   pip install Python-NBT
import python_nbt.nbt as nbt

def main():
    nbt_file = open_file()
    block_list = count_blocks(nbt_file)
    output_block_list(block_list)

def open_file():
    arg_list = sys.argv
    if len(arg_list) < 2:
        sys.exit("One argument representing .nbt file path is required.")

    return nbt.read_from_nbt_file(arg_list[1])

def count_blocks(nbt_file):
    palette = []
    for block_type in nbt_file["palette"].value:
        palette.append(block_type["Name"].value)
    
    block_list = {}
    for block in nbt_file["blocks"]:
        block_list[palette[block["state"].value]] = block_list.get(palette[block["state"].value], 0) + 1
    return block_list

def output_block_list(block_list):
    with open(sys.argv[1] + ".txt", "w") as f:
        for k, v in block_list.items():
            f.write(k + "," + str(v) + "\n")

if __name__ == "__main__":
    main()