from PyQt5.QtWidgets import QApplication, QWidget, QFormLayout, QCheckBox, QLineEdit


class HideAndSeek(QWidget):
    def __init__(self):
        def is_clicked(ln):
            return lambda x: ln.setVisible(x)

        super().__init__()
        self.setWindowTitle('Прятки для виджетов')
        self.setGeometry(300, 300, 345, 85)
        form = QFormLayout(self)

        for i in range(4):
            check_box = QCheckBox(str(i+1))
            line_edit = QLineEdit(str(i+1))
            line_edit.setVisible(False)
            form.addRow(check_box, line_edit)
            check_box.clicked.connect(is_clicked(line_edit))


app = QApplication([])
window = HideAndSeek()
window.show()
app.exec_()