How To Batch Extract Text From Multiple Pdfs In Python?

2025-07-10 04:38:34 432

3 คำตอบ

Theo
Theo
2025-07-11 19:44:52
Working with PDFs in Python is one of those tasks that seems simple until you hit real-world documents. My go-to stack combines 'PyPDF2' for standard text extraction and 'pdfplumber' for more complex layouts. Here's how I do it: First, I use 'os.listdir()' to get all PDFs in a folder, then process each file in a loop. 'pdfplumber' is great because it preserves spatial relationships between text blocks, which helps with forms or multi-column documents.

For scanned PDFs, I switch to a different approach using 'pytesseract'. You need to first convert PDF pages to images with libraries like 'pdf2image', then run OCR on each image. This is slower but necessary for non-text PDFs. I always add progress bars with 'tqdm' since these operations can take a while for large batches.

One pro tip: Always check for encryption before processing. Some PDFs are password-protected, and 'PyPDF2' will fail silently unless you handle 'PdfReadError'. I also recommend writing extracted text to individual .txt files with the same base name as the PDF—it keeps things organized for later analysis.
Mason
Mason
2025-07-11 21:30:57
extracting text from PDFs is one of those tasks that sounds simple but can get tricky. The best way I've found is using the 'PyPDF2' library. You start by looping through all PDF files in a directory, opening each one with 'PdfReader', then extracting text page by page. It's straightforward but has some quirks—some PDFs might be scanned images or have weird encodings. For those, you'd need OCR tools like 'pytesseract' alongside 'pdf2image' to convert pages to images first. The key is handling errors gracefully since not all PDFs play nice. I usually wrap everything in try-except blocks and log issues to a file so I know which documents need manual checking later.
Finn
Finn
2025-07-13 18:30:19
When I needed to extract text from hundreds of research papers last semester, Python saved me weeks of manual work. The simplest method uses 'pdfminer.six'—it handles complex PDFs better than most libraries. After installing it, you write a script that walks through your PDF folder, processes each file, and dumps the text into a structured format. I prefer JSON output because it's easy to analyze later.

For messy PDFs with tables or diagrams, 'camelot' works surprisingly well for table extraction while maintaining structure. It's not perfect, but when combined with 'pdfminer' for regular text, you can cover most cases. Always remember to clean the extracted text—PDFs often have weird line breaks or hidden characters. I use regular expressions to normalize whitespace and remove page headers/footers.

The cool part is scaling this with multiprocessing. If you have thousands of PDFs, Python's 'concurrent.futures' can dramatically speed things up by processing files in parallel. Just be mindful of memory usage with large batches.
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