Python2.7，PyQt4，实现键盘监听事件

# -*- coding: utf-8 -*-
from PyQt4 import QtCore, QtGui
import sys
from PyQt4.QtCore import *

try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s

try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)

reload(sys)
sys.setdefaultencoding('utf8')

class keyboard(QtGui.QWidget):
def __init__(self, parent=None):

QtGui.QWidget.__init__(self, parent)
self.initUi()
self.resize(400,300)
self.show()

def setTask(self, taskTemp):
self.task = taskTemp

def initUi(self):

self.label_1 = QtGui.QLabel("键盘监听小测试\n请按下‘D’，或者‘ESC’", self)

self.retranslateUi()
QtCore.QMetaObject.connectSlotsByName(self)

def retranslateUi(self):

self.label_1.setStyleSheet(_fromUtf8("font: 12pt \"微软雅黑\";\n"
""))

#键盘监听函数，继承了父类，这里重写
def keyPressEvent(self, event):
key = event.key()

#按下D
if key == QtCore.Qt.Key_D:
print "D is pressed"

#按ESC键，则退出程序
if key == QtCore.Qt.Key_Escape:
self.close()

if __name__ == "__main__":
import sys

app = QtGui.QApplication(sys.argv)

app.Encoding(QtGui.QApplication.UnicodeUTF8)
utfcodec = QTextCodec.codecForName("UTF-8")
QTextCodec.setCodecForTr(utfcodec)
QTextCodec.setCodecForLocale(utfcodec)
QTextCodec.setCodecForCStrings(utfcodec)

ui = keyboard()

sys.exit(app.exec_())