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pdf_file = pdfium.PdfDocument(file_path)

page_indices = [i for i in range(len(pdf_file))]

renderer = pdf_file.render(
    pdfium.PdfBitmap.to_pil,
    page_indices = page_indices, 
    scale = scale,
)

final_images = [] 

for i, image in zip(page_indices, renderer):
    
    image_byte_array = BytesIO()
    image.save(image_byte_array, format='jpeg', optimize=True)
    image_byte_array = image_byte_array.getvalue()
    final_images.append(dict({i:image_byte_array}))

return final_images`

    This probably means that you are not using fork to start your
    child processes and you have forgotten to use the proper idiom
    in the main module:

        if __name__ == '__main__':
            freeze_support()
            ...

    The "freeze_support()" line can be omitted if the program
    is not going to be frozen to produce an executable.`