from qgis.utils import iface

feat = QgsFeature()
mc = iface.mapCanvas()
layer = mc.layer(0)
provider = layer.dataProvider()
provider.select()

while(provider.nextFeature(feat)):
    geometry = feat.geometry()
    print "X Coord %d: " %geometry.asPoint().x()
    print "Y Coord %d: " %geometry.asPoint().y()
    print

provider = layer.dataProvider()
feat = QgsFeature()
while(provider.nextFeature(feat)):
    geom = feat.geometry()
    x = geom.asPoint().x()
    y = geom.asPoint().y()