import fitz # choose a version specific timer function (bytes == str in Python 2) mytime = time.clock if str is bytes else time.perf_counter def render_page(vector): """Render a page range of a document QtGui, QtWidgets, QtCore from PySide6.QtCore import Signal, Slot wrapper = "PySide6" my_timer = time.clock if str is bytes else time.perf_counter class DocForm(QtWidgets.QWidget): def __init__(self): super()