import sys
from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QLineEdit, QPushButton, QVBoxLayout

class Okno(QWidget):
    def __init__(self):
        super().__init__()

        self.koty_label = QLabel("Ilość kotów:")
        self.koty_entry = QLineEdit()
        self.ryby_label = QLabel("Ilość ryb:")
        self.ryby_entry = QLineEdit()
        self.kanar_label = QLabel("Ilość kanarków:")
        self.kanar_entry = QLineEdit()
        self.wynik_label = QLabel()

        self.oblicz_button = QPushButton("Oblicz")
        self.oblicz_button.clicked.connect(self.oblicz_nogi)

        vbox = QVBoxLayout()
        vbox.addWidget(self.koty_label)
        vbox.addWidget(self.koty_entry)
        vbox.addWidget(self.ryby_label)
        vbox.addWidget(self.ryby_entry)
        vbox.addWidget(self.kanar_label)
        vbox.addWidget(self.kanar_entry)
        vbox.addWidget(self.oblicz_button)
        vbox.addWidget(self.wynik_label)
        self.setLayout(vbox)

    def oblicz_nogi(self):
        ilosc_kotow = int(self.koty_entry.text())
        ilosc_ryb = int(self.ryby_entry.text())
        ilosc_kanar = int(self.kanar_entry.text())
        suma_nog = 4 * ilosc_kotow + 0 * ilosc_ryb + 2 * ilosc_kanar
        self.wynik_label.setText("Ilość nóg: " + str(suma_nog))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    okno = Okno()
    okno.show()
    sys.exit(app.exec_())