How to insert a button inside a QLineEdit

Question

I need help inserting a button inside in a QLineEdit that can call a function.

For example, like this google image:

Answer 1

class LineEditFileDialogWidget(QtWidgets.QLineEdit):
    def __init__(self, parent=None):
        super(LineEditFileDialogWidget, self).__init__(parent)
        self.setReadOnly(True)

        icon = QtWidgets.QApplication.style().standardIcon(QtWidgets.QStyle.SP_DirIcon)
        self.action = self.addAction(icon, QtWidgets.QLineEdit.TrailingPosition)
        self.action.triggered.connect(some function)

Here is an example of using the icon along with QLineEdit