如何在PyQGIS中输入点坐标?

我想编写一个脚本,提示用户输入X和Y坐标。这些坐标将向现有形状文件添加点。另外,我应该使用哪个函数调用来获取这些坐标?

vectorLyr = QgsVectorLayer("D:/Projekty/qgis_projekt/forty922.shp", "Forty", "ogr")
vpr = vectorLyr.dataProvider()
x = QInputDialog.getDouble(None, 'input', 'Insert x: ')
y = QInputDialog.getDouble(None, 'input', 'Insert y: ')
pnt = QgsGeometry.fromPoint(QgsPoint(x,y))
f = QgsFeature()
f.setGeometry(pnt)
vpr.addFeatures([f])
vectorLyr.updateExtents()
QgsMapLayerRegistry.instance().addMapLayers([vectorLyr])

输入窗口工作正常,但Python控制台抛出此语句

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "c:/users/hubi/appdata/local/temp/tmpxkrjpx.py", line 5, in <module>
    pnt = QgsGeometry.fromPoint(QgsPoint(x,y))
TypeError: arguments did not match any overloaded call:
  QgsPoint(): too many arguments
  QgsPoint(QgsPoint): argument 1 has unexpected type 'tuple'
  QgsPoint(float, float): argument 1 has unexpected type 'tuple'
  QgsPoint(QPointF): argument 1 has unexpected type 'tuple'
  QgsPoint(QPoint): argument 1 has unexpected type 'tuple'

当我向pnt变量中添加一个常量时,它工作得很好。

pnt = QgsGeometry.fromPoint(QgsPoint(361637,501172))

有什么想法吗?