returnPressed

#!/usr/bin/env python

import PySide.QtGui as QtGui
from PySide.QtGui import QApplication, QMainWindow
import sys

class TestWindow(QMainWindow):

    def __init__(self):
        super(TestWindow, self).__init__()
        self.spinbox = QtGui.QDoubleSpinBox(self)
        self.spinbox.lineEdit().returnPressed.connect(
            self.test_method)
    def test_method(self):
        print("Return pressed")

app = QtGui.QApplication(sys.argv)

w = TestWindow()

w.show()

sys.exit(app.exec_())