调用对象class的方法时出现attributeError

Question

from PyQt5 import uic
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
app = QApplication([])
window = uic.loadUi("exercise2.ui")


class Car:
    def __init__(self):
        self.speed = 5

    def accelerate(self):
        if self.speed + 5 < 20:
            self.speed += 5
        return self.speed

    def decelerate(self):
        if self.speed - 5 >= 0:
            self.speed -= 5
        return self.speed

    def animate(self):
        currentX = window.car.x()
        window.car.setGeometry(currentX + self.speed, 30, 120, 70)


movingCar = Car()
timer = QTimer()
timer.timeout.connect(movingCar.animate)
timer.start(40)

window.accelerateButton.clicked.connect(Car.accelerate)
window.brakeButton.clicked.connect(Car.decelerate)

window.show()
app.exec_()

正在尝试用加速和减速按钮制作汽车动画。当我按下按钮 accelerate/decelerate 时，我在两种方法的 'if' 语句中都收到错误“AttributeError：'bool' 对象没有属性 'speed'”。有人可以帮我弄清楚出了什么问题吗？谢谢！

Answer 1

您应该向 clicked.connect 传递一个绑定到相关对象的方法，而不是未绑定的方法 Car.accelerate:

window.accelerateButton.clicked.connect(movingCar.accelerate)
window.brakeButton.clicked.connect(movingCar.decelerate)

调用对象class的方法时出现attributeError

attributeError when calling method of object class

python

attributes

class

object