To run this:

• pip3 install -r requirements.txt

• $ python pdf_merger.py --help
  

  Output:

  usage: pdf_merger.py [-h] -i [INPUT_FILES [INPUT_FILES ...]] [-p [PAGE_RANGE [PAGE_RANGE ...]]] -o OUTPUT_FILE [-b BOOKMARK]
  
  Available Options
  
  optional arguments:
  -h, --help            show this help message and exit
  -i [INPUT_FILES [INPUT_FILES ...]], --input_files [INPUT_FILES [INPUT_FILES ...]]
                          Enter the path of the files to process
  -p [PAGE_RANGE [PAGE_RANGE ...]], --page_range [PAGE_RANGE [PAGE_RANGE ...]]
                          Enter the pages to consider e.g.: (0,2) -> First 2 pages
  -o OUTPUT_FILE, --output_file OUTPUT_FILE
                          Enter a valid output file
  -b BOOKMARK, --bookmark BOOKMARK
                          Bookmark resulting file
  

• To merge bert-paper.pdf with letter.pdf into a new combined.pdf:

  $ python pdf_merger.py -i bert-paper.pdf,letter.pdf -o combined.pdf