Large PDF files (2k-4k pages per file). All files have a similar structure. Formed as a legacy from office tables.

• get a file of table-like data, with the ability to use with pandas
• prevent "out-of-memory" error
• save the results to a file in a size-insensitive format
• be able to track progress and estimated time

1. Count the number of pages of each file
2. Split page range for part-by-part convertion (single page makes slowly)
3. Convert part with attaching to common dataframe
4. Save complete dataframe to pickle file