Calculadora: keyPressEvent do QLineEdit e criando um Signal

aula202-calculadora/buttons.py

@@ -59,7 +59,12 @@ class ButtonsGrid(QGridLayout):
         self._equation = value
         self.info.setText(value)
 
+    def vouApagarVocê(self):
+        print('Signal recebido por "vouApagarVocê" em', type(self).__name__)
+
     def _makeGrid(self):
+        self.display.eqRequested.connect(self.vouApagarVocê)
+
         for rowNumber, rowData in enumerate(self._gridMask):
             for colNumber, buttonText in enumerate(rowData):
                 button = Button(buttonText)
@@ -81,7 +86,7 @@ class ButtonsGrid(QGridLayout):
         if text == 'C':
             self._connectButtonClicked(button, self._clear)
 
-        if text in 'D':
+        if text == 'D':
             self._connectButtonClicked(button, self.display.backspace)
 
         if text in '+-/*^':
@@ -90,7 +95,7 @@ class ButtonsGrid(QGridLayout):
                 self._makeSlot(self._operatorClicked, button)
             )
 
-        if text in '=':
+        if text == '=':
             self._connectButtonClicked(button, self._eq)
 
     def _makeSlot(self, func, *args, **kwargs):