PyQt5/Python 3+でkeyPressEvent（）メソッドが動作しない

Question

私はPythonの初心者です。私は "Qtデザイナ"を使って簡単な電卓アプリを設計し、 "pyuic5"を使って "ui"ファイルを "py"に変換しました。

しかし、私がkeyPressEvent（）メソッドを追加したとき、メソッドは機能しませんでした。そして私は理由を知らない。私はこの問題を克服するためにsetFocus（）メソッドを試しましたが失敗しました。

誰でも教えてください。

以下の私のコードを確認してください：

from PyQt5 import QtCore, QtGui, QtWidgets 
import sys 


class Ui_MainWindow(object): 
    def setupUi(self, MainWindow): 
     MainWindow.setMinimumSize(QtCore.QSize(330, 280)) 
     MainWindow.setMaximumSize(QtCore.QSize(330, 280)) 

     self.centralwidget = QtWidgets.QWidget(MainWindow) 


     self.lineEdit_display = QtWidgets.QLineEdit(self.centralwidget) 
     self.lineEdit_display.setGeometry(QtCore.QRect(10, 0, 311, 41)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     font.setBold(True) 
     font.setWeight(75) 
     self.lineEdit_display.setFont(font) 
     self.lineEdit_display.setMaxLength(15) 
     self.lineEdit_display.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter) 
     self.lineEdit_display.setReadOnly(True) 


     self.pButton_0 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_0.setGeometry(QtCore.QRect(10, 200, 51, 41)) 
     self.pButton_0.setCursor(QtGui.QCursor(QtCore.Qt.ArrowCursor)) 

     self.pButton_00 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_00.setGeometry(QtCore.QRect(70, 200, 51, 41)) 

     self.pButton_dot = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_dot.setGeometry(QtCore.QRect(130, 200, 51, 41)) 

     self.pButton_1 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_1.setGeometry(QtCore.QRect(10, 150, 51, 41)) 

     self.pButton_2 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_2.setGeometry(QtCore.QRect(70, 150, 51, 41)) 

     self.pButton_3 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_3.setGeometry(QtCore.QRect(130, 150, 51, 41)) 

     self.pButton_4 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_4.setGeometry(QtCore.QRect(10, 100, 51, 41)) 

     self.pButton_5 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_5.setGeometry(QtCore.QRect(70, 100, 51, 41)) 

     self.pButton_6 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_6.setGeometry(QtCore.QRect(130, 100, 51, 41)) 

     self.pButton_7 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_7.setGeometry(QtCore.QRect(10, 50, 51, 41)) 

     self.pButton_8 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_8.setGeometry(QtCore.QRect(70, 50, 51, 41)) 

     self.pButton_9 = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_9.setGeometry(QtCore.QRect(130, 50, 51, 41)) 

     self.pButton_add = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_add.setGeometry(QtCore.QRect(210, 50, 51, 41)) 

     self.pButton_subtract = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_subtract.setGeometry(QtCore.QRect(210, 100, 51, 41)) 

     self.pButton_multiplication = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_multiplication.setGeometry(QtCore.QRect(210, 150, 51, 41)) 

     self.pButton_divide = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_divide.setGeometry(QtCore.QRect(210, 200, 51, 41)) 

     self.pButton_equal = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_equal.setGeometry(QtCore.QRect(270, 150, 51, 91)) 

     self.pButton_ac = QtWidgets.QPushButton(self.centralwidget) 
     self.pButton_ac.setGeometry(QtCore.QRect(270, 50, 51, 91)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     self.pButton_ac.setFont(font) 
     self.pButton_ac.setDefault(True) 


     MainWindow.setCentralWidget(self.centralwidget) 
     self.menubar = QtWidgets.QMenuBar(MainWindow) 
     self.menubar.setGeometry(QtCore.QRect(0, 0, 330, 27)) 
     self.menuMain = QtWidgets.QMenu(self.menubar) 
     MainWindow.setMenuBar(self.menubar) 
     self.actionExit = QtWidgets.QAction(MainWindow) 
     self.actionAbout = QtWidgets.QAction(MainWindow) 
     self.menuMain.addAction(self.actionExit) 
     self.menuMain.addAction(self.actionAbout) 
     self.menubar.addAction(self.menuMain.menuAction()) 

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

    def retranslateUi(self, MainWindow): 
     _translate = QtCore.QCoreApplication.translate 
     MainWindow.setWindowTitle(_translate("MainWindow", "Simple Calculator")) 
     MainWindow.setToolTip(_translate("MainWindow", "Simple Calculator")) 
     self.pButton_0.setToolTip(_translate("MainWindow", "0")) 
     self.pButton_0.setText(_translate("MainWindow", "0")) 
     self.pButton_00.setToolTip(_translate("MainWindow", "00")) 
     self.pButton_00.setText(_translate("MainWindow", "00")) 
     self.pButton_dot.setToolTip(_translate("MainWindow", ".")) 
     self.pButton_dot.setText(_translate("MainWindow", ".")) 
     self.pButton_1.setToolTip(_translate("MainWindow", "1")) 
     self.pButton_1.setText(_translate("MainWindow", "1")) 
     self.pButton_2.setToolTip(_translate("MainWindow", "2")) 
     self.pButton_2.setText(_translate("MainWindow", "2")) 
     self.pButton_3.setToolTip(_translate("MainWindow", "3")) 
     self.pButton_3.setText(_translate("MainWindow", "3")) 
     self.pButton_4.setToolTip(_translate("MainWindow", "4")) 
     self.pButton_4.setText(_translate("MainWindow", "4")) 
     self.pButton_5.setToolTip(_translate("MainWindow", "5")) 
     self.pButton_5.setText(_translate("MainWindow", "5")) 
     self.pButton_6.setToolTip(_translate("MainWindow", "6")) 
     self.pButton_6.setText(_translate("MainWindow", "6")) 
     self.pButton_7.setToolTip(_translate("MainWindow", "7")) 
     self.pButton_7.setText(_translate("MainWindow", "7")) 
     self.pButton_8.setToolTip(_translate("MainWindow", "8")) 
     self.pButton_8.setText(_translate("MainWindow", "8")) 
     self.pButton_9.setToolTip(_translate("MainWindow", "9")) 
     self.pButton_9.setText(_translate("MainWindow", "9")) 
     self.pButton_add.setToolTip(_translate("MainWindow", "+")) 
     self.pButton_add.setText(_translate("MainWindow", "+")) 
     self.pButton_subtract.setToolTip(_translate("MainWindow", "-")) 
     self.pButton_subtract.setText(_translate("MainWindow", "-")) 
     self.pButton_multiplication.setToolTip(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_multiplication.setText(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_divide.setToolTip(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_divide.setText(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_equal.setToolTip(_translate("MainWindow", "=")) 
     self.pButton_equal.setText(_translate("MainWindow", "=")) 
     self.pButton_ac.setToolTip(_translate("MainWindow", "AC")) 
     self.pButton_ac.setText(_translate("MainWindow", "AC")) 
     self.lineEdit_display.setToolTip(_translate("MainWindow", "Display")) 
     self.lineEdit_display.setText(_translate("MainWindow", "0")) 
     self.menuMain.setTitle(_translate("MainWindow", "Mai&n")) 
     self.actionExit.setText(_translate("MainWindow", "&Exit")) 
     self.actionAbout.setText(_translate("MainWindow", "&About")) 

    def keyPressEvent(self, e): 
     print(e.key()) 

if __name__ == "__main__": 

    app = QtWidgets.QApplication(sys.argv) 

    MainWindow = QtWidgets.QMainWindow() 
    ui = Ui_MainWindow() 
    ui.setupUi(MainWindow) 
    MainWindow.show() 

    MainWindow.setFocus() #TRYING TO SET FOCUS FOR keyPressEvent 

    sys.exit(app.exec_()) 

Answer 1

Sirさん、あなたの構文で何が間違っていたのか特定できませんでしたので、コードをできるだけ似たように編集しました。

あなたのコードはいくつか変更されていますが、それがうまくいくかどうかはこちらをご覧ください。

from PyQt5 import QtCore, QtGui, QtWidgets 
import sys 

from PyQt5.QtWidgets import QAction 
from PyQt5.QtWidgets import QLineEdit 
from PyQt5.QtWidgets import QMainWindow 
from PyQt5.QtWidgets import QMenu 
from PyQt5.QtWidgets import QMenuBar 
from PyQt5.QtWidgets import QPushButton 
from PyQt5.QtWidgets import QWidget 


class Ui_MainWindow(QMainWindow): 

    def __init__(self): 
     super(Ui_MainWindow, self).__init__() 
     # self.setupUi() 

    def setupUi(self): 
     self.setMinimumSize(QtCore.QSize(330, 280)) 
     self.setMaximumSize(QtCore.QSize(330, 280)) 

     self.centralwidget = QWidget() 


     self.lineEdit_display = QLineEdit(self.centralwidget) 
     self.lineEdit_display.setGeometry(QtCore.QRect(10, 0, 311, 41)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     font.setBold(True) 
     font.setWeight(75) 
     self.lineEdit_display.setFont(font) 
     self.lineEdit_display.setMaxLength(15) 
     self.lineEdit_display.setAlignment(QtCore.Qt.AlignRight|QtCore.Qt.AlignTrailing|QtCore.Qt.AlignVCenter) 
     self.lineEdit_display.setReadOnly(True) 


     self.pButton_0 = QPushButton(self.centralwidget) 
     self.pButton_0.setGeometry(QtCore.QRect(10, 200, 51, 41)) 
     self.pButton_0.setCursor(QtGui.QCursor(QtCore.Qt.ArrowCursor)) 

     self.pButton_00 = QPushButton(self.centralwidget) 
     self.pButton_00.setGeometry(QtCore.QRect(70, 200, 51, 41)) 

     self.pButton_dot = QPushButton(self.centralwidget) 
     self.pButton_dot.setGeometry(QtCore.QRect(130, 200, 51, 41)) 

     self.pButton_1 = QPushButton(self.centralwidget) 
     self.pButton_1.setGeometry(QtCore.QRect(10, 150, 51, 41)) 

     self.pButton_2 = QPushButton(self.centralwidget) 
     self.pButton_2.setGeometry(QtCore.QRect(70, 150, 51, 41)) 

     self.pButton_3 = QPushButton(self.centralwidget) 
     self.pButton_3.setGeometry(QtCore.QRect(130, 150, 51, 41)) 

     self.pButton_4 = QPushButton(self.centralwidget) 
     self.pButton_4.setGeometry(QtCore.QRect(10, 100, 51, 41)) 

     self.pButton_5 = QPushButton(self.centralwidget) 
     self.pButton_5.setGeometry(QtCore.QRect(70, 100, 51, 41)) 

     self.pButton_6 = QPushButton(self.centralwidget) 
     self.pButton_6.setGeometry(QtCore.QRect(130, 100, 51, 41)) 

     self.pButton_7 = QPushButton(self.centralwidget) 
     self.pButton_7.setGeometry(QtCore.QRect(10, 50, 51, 41)) 

     self.pButton_8 = QPushButton(self.centralwidget) 
     self.pButton_8.setGeometry(QtCore.QRect(70, 50, 51, 41)) 

     self.pButton_9 = QPushButton(self.centralwidget) 
     self.pButton_9.setGeometry(QtCore.QRect(130, 50, 51, 41)) 

     self.pButton_add = QPushButton(self.centralwidget) 
     self.pButton_add.setGeometry(QtCore.QRect(210, 50, 51, 41)) 

     self.pButton_subtract = QPushButton(self.centralwidget) 
     self.pButton_subtract.setGeometry(QtCore.QRect(210, 100, 51, 41)) 

     self.pButton_multiplication = QPushButton(self.centralwidget) 
     self.pButton_multiplication.setGeometry(QtCore.QRect(210, 150, 51, 41)) 

     self.pButton_divide = QPushButton(self.centralwidget) 
     self.pButton_divide.setGeometry(QtCore.QRect(210, 200, 51, 41)) 

     self.pButton_equal = QPushButton(self.centralwidget) 
     self.pButton_equal.setGeometry(QtCore.QRect(270, 150, 51, 91)) 

     self.pButton_ac = QPushButton(self.centralwidget) 
     self.pButton_ac.setGeometry(QtCore.QRect(270, 50, 51, 91)) 
     font = QtGui.QFont() 
     font.setPointSize(14) 
     self.pButton_ac.setFont(font) 
     self.pButton_ac.setDefault(True) 

     self.setCentralWidget(self.centralwidget) 
     self.menubar = QMenuBar(self) 
     self.menubar.setGeometry(QtCore.QRect(0, 0, 330, 27)) 
     self.menuMain = QMenu(self.menubar) 
     self.setMenuBar(self.menubar) 
     self.actionExit = QAction(self) 
     self.actionAbout = QAction(self) 
     self.menuMain.addAction(self.actionExit) 
     self.menuMain.addAction(self.actionAbout) 
     self.menubar.addAction(self.menuMain.menuAction()) 

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

    def retranslateUi(self): 
     _translate = QtCore.QCoreApplication.translate 
     self.setWindowTitle(_translate("MainWindow", "Simple Calculator")) 
     self.setToolTip(_translate("MainWindow", "Simple Calculator")) 
     self.pButton_0.setToolTip(_translate("MainWindow", "0")) 
     self.pButton_0.setText(_translate("MainWindow", "0")) 
     self.pButton_00.setToolTip(_translate("MainWindow", "00")) 
     self.pButton_00.setText(_translate("MainWindow", "00")) 
     self.pButton_dot.setToolTip(_translate("MainWindow", ".")) 
     self.pButton_dot.setText(_translate("MainWindow", ".")) 
     self.pButton_1.setToolTip(_translate("MainWindow", "1")) 
     self.pButton_1.setText(_translate("MainWindow", "1")) 
     self.pButton_2.setToolTip(_translate("MainWindow", "2")) 
     self.pButton_2.setText(_translate("MainWindow", "2")) 
     self.pButton_3.setToolTip(_translate("MainWindow", "3")) 
     self.pButton_3.setText(_translate("MainWindow", "3")) 
     self.pButton_4.setToolTip(_translate("MainWindow", "4")) 
     self.pButton_4.setText(_translate("MainWindow", "4")) 
     self.pButton_5.setToolTip(_translate("MainWindow", "5")) 
     self.pButton_5.setText(_translate("MainWindow", "5")) 
     self.pButton_6.setToolTip(_translate("MainWindow", "6")) 
     self.pButton_6.setText(_translate("MainWindow", "6")) 
     self.pButton_7.setToolTip(_translate("MainWindow", "7")) 
     self.pButton_7.setText(_translate("MainWindow", "7")) 
     self.pButton_8.setToolTip(_translate("MainWindow", "8")) 
     self.pButton_8.setText(_translate("MainWindow", "8")) 
     self.pButton_9.setToolTip(_translate("MainWindow", "9")) 
     self.pButton_9.setText(_translate("MainWindow", "9")) 
     self.pButton_add.setToolTip(_translate("MainWindow", "+")) 
     self.pButton_add.setText(_translate("MainWindow", "+")) 
     self.pButton_subtract.setToolTip(_translate("MainWindow", "-")) 
     self.pButton_subtract.setText(_translate("MainWindow", "-")) 
     self.pButton_multiplication.setToolTip(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_multiplication.setText(_translate("MainWindow", "\N{MULTIPLICATION SIGN}")) 
     self.pButton_divide.setToolTip(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_divide.setText(_translate("MainWindow", "\N{DIVISION SIGN}")) 
     self.pButton_equal.setToolTip(_translate("MainWindow", "=")) 
     self.pButton_equal.setText(_translate("MainWindow", "=")) 
     self.pButton_ac.setToolTip(_translate("MainWindow", "AC")) 
     self.pButton_ac.setText(_translate("MainWindow", "AC")) 
     self.lineEdit_display.setToolTip(_translate("MainWindow", "Display")) 
     self.lineEdit_display.setText(_translate("MainWindow", "0")) 
     self.menuMain.setTitle(_translate("MainWindow", "Mai&n")) 
     self.actionExit.setText(_translate("MainWindow", "&Exit")) 
     self.actionAbout.setText(_translate("MainWindow", "&About")) 

    def keyPressEvent(self, e): 
     print(e.key()) 

if __name__ == "__main__": 

    app = QtWidgets.QApplication(sys.argv) 

    ui = Ui_MainWindow() 
    ui.setupUi() 
    ui.show() 

    sys.exit(app.exec_()) 

はそれがマウスイベントについて^^

Answer 2

あなたがイベントに各ウィジェットを接続する必要があるように見えます。 GUIはイベント駆動型プログラミングです。あなたが見てきたように、ユーザーが何らかのアクションを取るまであなたの目の前に座っているだけで、アクションごとに何が起こるかを定義するのはプログラマの責任です。

たとえば、電卓用のボタンがあります。数字ボタンを押すと、その数字を表示を表すテキストボックスに表示すると仮定します。そうであれば、「クリックされた」イベントを処理する必要があります。類似したもの

self.pButton_9.clicked.connect(self.click_9) # connects button to action by defining a callback - an action to handle the event. 

def click_9(self): 
    self.lineEdit_display.text += '9 ' 

私が見たイントロのベストチュートリアルの1つはHereです。私は通常、すべてのPythonクラスでGUIプログラミングの学習を始めます。