convert images to pdf

Date: 20230210

how to run

1. Locate your images: define path_in and path_out, the folders containing images should be put in path_in. One thing you should know is that the code is capable of handling multiple folders containing images, so finally you will obtain multiple pdf files.
2. Run the python code img2pdf with python img2pdf.py.
3. Check out the path_out and you can obtain the pdf files if the code runs successfully.