Why inserted text is not visible on some pdfs

[aarthihWN]

Hello,
My current requirement is to paginate a bunch of pdfs sequentially with page number on the bottom right of the page. Below is the code I used, considering that many of the pages of the pdfs were rotated. While this works for most pdfs, it does not for a few unusual files, with and without images. Have attached sample pdfs(or part of it). On one , the number does not show up at all. On the other, am not able to control the position. Please help. Thank you.
SinglePage.pdf
15. R-012 Drawing Ref. 13139-SE-RES-0-003-02 1.pdf

page_number_for_print = 1
for path in pathlist:
    doc = fitz.open(path)
    for page in doc:
        if page.rotation == 90:
            page.insert_text((page.rect.height-20,60),str(page_number_for_print), fontsize=28, rotate=90, color=(0, 0, 0))
        elif page.rotation == 180:
            page.insert_text((60, 20), str(page_number_for_print), fontsize=18, rotate=180,color=(0,0,0))
        elif page.rotation == 270:
            page.insert_text((20, page.rect.width - 60), str(page_number_for_print), stroke_opacity=3, fontsize=18,color=(0,0,0), rotate=270)                
        else:
            page.insert_text((page.rect.width - 60, page.rect.height-20), str(page_number_for_print), fontsize=18,color=(0,0,0))
        page_number_for_print += 1
    doc.saveIncr()
    doc.close()

[JorjMcKie]

Your only problem are "geometry changes":
If you do a page.clean_contents() before inserting anything, you should be fine.

BTW: The example files attached here are read-only, so you actually should get a "permission denied" or similar exception when using "saveIncr()"?

[aarthihWN]

Thank you! That worked.
Yes, these files are manually saved as editable before running the code. Is there a way to check this in the code?

[JorjMcKie]

Is there a way to check this in the code?

not within PyMuPDF - yet. But of course no problem to do this check with the Python os module. The action taken in the problem case would be raising an exception however, which already is done today by the underlying C library.

[JorjMcKie]

In Python you can check whether a path / filename is writable via if os.stat(filename).st_mode & 128: print("writable!").
Where 128 = stat.S_IWUSR, a constant defined in the stat module.

[aarthihWN]

Thanks you. The file being read-only is not a problem as the files need to be saved along with other modifications as new files. So that is resolved. Thanks again for your help!