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I'm just trying to create a pdf from a list of images in a forder. This is the code:

file_path = input('file path of the images: ')
list = os.listdir(file_path)

pdfimages = [
    Image.open(file_path + f)
    for f in list
]
print('=== Images used to create the PDF ===\n' +'>>> '+str(list))

pdf_path = file_path + pdf_name + '.pdf'

pdfimages[0].save(
    pdf_path, "PDF" , resolution=100.0, save_all=True, append_images=pdfimages[1:]
)
print('=== PDF created and saved! ===')
print('=== Check ===\n' +'>>> '+str(file_path))

The pdf is created, but the order of the photos (checked here: print('=== Images used to create the PDF ===\n' +'>>> '+str(list)) ) is not correct, even though it is correct in the folder. Thi is what the code written before shows:

=== Images used to create the PDF ===
>>> ['bho1.jpg', 'bho10.jpg', 'bho11.jpg', 'bho12.jpg', 'bho13.jpg', 'bho14.jpg', 'bho15.jpg', 'bho16.jpg', 'bho17.jpg', 'bho18.jpg', 'bho19.jpg', 'bho2.jpg', 'bho20.jpg', 'bho21.jpg', 'bho22.jpg', 'bho23.jpg', 'bho24.jpg', 'bho25.jpg', 'bho26.jpg', 'bho27.jpg', 'bho28.jpg', 'bho29.jpg', 'bho3.jpg', 'bho30.jpg', 'bho31.jpg', 'bho32.jpg', 'bho33.jpg', 'bho34.jpg', 'bho35.jpg', 'bho36.jpg', 'bho37.jpg', 'bho38.jpg', 'bho39.jpg', 'bho4.jpg', 'bho40.jpg', 'bho41.jpg', 'bho42.jpg', 'bho43.jpg', 'bho44.jpg', 'bho45.jpg', 'bho46.jpg', 'bho47.jpg', 'bho48.jpg', 'bho49.jpg', 'bho5.jpg', 'bho50.jpg', 'bho51.jpg', 'bho52.jpg', 'bho53.jpg', 'bho54.jpg', 'bho55.jpg', 'bho56.jpg', 'bho57.jpg', 'bho58.jpg', 'bho59.jpg', 'bho6.jpg', 'bho60.jpg', 'bho7.jpg', 'bho8.jpg', 'bho9.jpg']

As you can see the pattern isn't bho1.jpg, bho2.jpg, bho3.jpg etc..., instead it gets firstly the images with the one (bho1.jpg, bho10.jpg, bho11.jpg, bho12.jpg etc...) than with the two and it goes one like this. Someone knows why?

mkrieger1
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Edoardo Balducci
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    Does this answer your question? [Non-alphanumeric list order from os.listdir()](https://stackoverflow.com/questions/4813061/non-alphanumeric-list-order-from-os-listdir) – mkrieger1 Apr 09 '22 at 11:00
  • See [this answer](https://stackoverflow.com/a/48030307). – mkrieger1 Apr 09 '22 at 11:01

1 Answers1

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This is mostly because you are dealing with strings, so they are sorted alphabetically.

I would say to parse the number from each string. You can to this with a simple int(filename[3:-4]), and sort the filenames using these integer values. In full, you could to this:

file_names = os.listdir(file_path)
file_names = sorted(file_names, key=lambda s: int(s[3:-4]))

You could also use regex to parse the integers, but in your case, you can also do it with indexing ([3:-4]).

I also took the liberty to rename your list variable to file_name, list is a reserved variable in python and shouldn't be changed.

Jaka
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