time1 = time.time()
doc_files = []
outfile = "combo2.pdf"
time2 = time.time()
# dirs = os.listdir(path)
file_dir = r"I:\临时文件3.0"



for root, dirs, filenames in walk(file_dir):
for d in dirs:
file_list = [f for f in os.listdir(os.path.join(root,d)) if f.endswith('.pdf')]
file_list = [os.path.join(root,d, filename) for filename in file_list]




file_merger = PdfFileMerger()
for pdf in pdf_lst:

file_merger.append(pdf) # 合并pdf文件

file_merger.write(os.path.join(root, d, out))
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