什么是“ a = ...”？在'.pyi'文件中

Question

我在“ PyQt / QtGui.pyi”文件中找到了它

cursorPosition = ... # type: int

我想知道a = ...是什么吗？

ex）

class PaintContext(sip.simplewrapper):
    clip = ... # type: QtCore.QRectF
    cursorPosition = ... # type: int
    palette = ... # type: 'QPalette'
    selections = ...