pdfminer.pdfdevice

class PDFDevice

No clue what this actually does just yet, other than it appears to be involved heavily in processing the PDF (judging by the fact that it includes functions like begin_page, begin_tag, etc.)

function __init__(rsrc)

rsrc I’m presuming needs to be a pdfinterp.PDFResourceManager instance (but it doesn’t actually appear to be used…)