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import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.uic import loadUi


class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        loadUi("mainwindow.ui", self)
        buttons = (self.pushButton_left, self.pushButton_middle, self.pushButton_right)

        for button in buttons:
            button.setVisible(True)
            print(button.isVisible())


def main():
    app = QApplication(sys.argv)
    main_window = MainWindow()
    main_window.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

Code: Alles auswählen

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>500</width>
    <height>200</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <layout class="QGridLayout" name="gridLayout">
    <item row="0" column="0">
     <widget class="QPushButton" name="pushButton_left">
      <property name="locale">
       <locale language="English" country="UnitedKingdom"/>
      </property>
      <property name="text">
       <string>PushButton</string>
      </property>
     </widget>
    </item>
    <item row="0" column="1">
     <widget class="QPushButton" name="pushButton_middle">
      <property name="locale">
       <locale language="English" country="UnitedKingdom"/>
      </property>
      <property name="text">
       <string>PushButton</string>
      </property>
     </widget>
    </item>
    <item row="0" column="2">
     <widget class="QPushButton" name="pushButton_right">
      <property name="locale">
       <locale language="English" country="UnitedKingdom"/>
      </property>
      <property name="text">
       <string>PushButton</string>
      </property>
     </widget>
    </item>
   </layout>
  </widget>
  <widget class="QMenuBar" name="menubar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>500</width>
     <height>24</height>
    </rect>
   </property>
  </widget>
  <widget class="QStatusBar" name="statusbar"/>
 </widget>
 <resources/>
 <connections/>
</ui>