[Python] How to use python to extract files from folder base on the first 7 digits file name

I am still a new learner in writing python script. I have a question here:

I have a "folder" which contain multiple sub folders where I wish to extract PDF files base on the same first 7 digits file name in these sub folders (eg File name:AB12345_J,AB12345_K) and move these files to another new folder that I created as "Duplicate Folder". But I got a error message shown below:

Traceback (most recent call last)
AttributeError
Cell In[3], line 19
16 break
18 if not if_dupl:
---> 19 duplicateFiles.append([file_x])
21 #state the output folder
22 Output_dir = Path('Duplicate')

AttributeError: 'set' object has no attribute 'append'


This is my python script:

# Importing Libraries
import os
from pathlib import Path
from filecmp import cmp

# list of doc
DATA_DIR = Path("folder")
files = sorted(os.listdir(DATA_DIR))

# list same content
pdf_files = list(DATA_DIR.glob("\*.pdf"))
duplicateFiles = set(\[file.name\[:6\] for file in pdf_files\])

# compare the documents
for file_x in files:

if_dupl = False

for class_ in duplicateFiles:
# Comparing files()
class_[6]
if_dupl = cmp(
DATA_DIR / file_x,
DATA_DIR / class_[6],
shallow=False )

if if_dupl:
class_.append(file_x)
break

if not if_dupl:
duplicateFiles.append([file_x])

#state the output folder
Output_dir = Path("Duplicate Folder")

#save to output
with open(Output_dir,'wb') as outputfle:
out_file.write(source_file.read())

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