Question

我用Pyqt4编写了一个Snake游戏。

处理我的物品时遇到了严重的问题。问题是我有4个对象（我没有包括剩下的两个因为我认为没有重要但我可以上传，如果有必要）并且当Screen对象调用Example对象时会丢失一个错误并且它不起作用。但是如果Example使用Screen对象创建一个var，则不会丢弃错误！

class Screen(QtGui.QWidget):#This class wrapp the game with the snake and the food
comprovamenjar = 0 
def __init__(self):
    super(Screen,self).__init__()
    self.initUI()
    self.snake = Snake()
    self.menjar = Menjar()
    self.example = Example() #< --------------------------------This provoke error
def initUI(self):
    pass       

def paintEvent(self,e): #We paint stuff..
#The code from below didn't work also
    """if self.snake.coordenadax < 0 or self.snake.coordenadax > self.height or self.snake.coordenaday < 0 or self.snake.coordenaday > self.width :
        #self.example.timer.stop()
        pass
    else:"""
    qp = QtGui.QPainter()
    qp.begin( self )
    self.snake.pintacap( qp,self.food)#Paint Snake's Head
    self.snake.pintacos( qp,self.food)#Paint Snake's Body
    self.comprovamenjar = self.snake.pintacos#Check food
    self.menjar.pinta( qp,self.snake)#Paint Food
    qp.end()

class Example(QtGui.QWidget): #This Wrapp again the game with all the stuff
p = None
def __init__(self):
    super(Example, self).__init__()

    self.initUI()
def keyPressEvent(self, e): #Keyboard functions
    if e.key() == QtCore.Qt.Key_Up:
        direccio = 3
    elif e.key() == QtCore.Qt.Key_Down:
        direccio = 2
    elif e.key() == QtCore.Qt.Key_Right:
        direccio = 1
    elif e.key() == QtCore.Qt.Key_Left:
        direccio = 0
    self.p.serp.startup = 1
    self.p.serp.direccio(direccio,self.p)      
def initUI(self): #Screen options
    #Screen
    self.p = Screen()
    self.p.setParent(self)
    self.p.move(0,0)
    self.p.resize(self.p.height(),self.p.width())
    self.timer = QtCore.QTimer()
    self.p.amplada = self.p.width()
    self.p.alcada = self.p.height()
    self.timer.timeout.connect(self.p.repaint)#colbac
    self.timer.start(15)##########################################Snake's Speed Movement
    self.setGeometry(100, 100, self.p.amplada, self.p.alcada)
    self.setWindowTitle('Signal & slot')
    self.show()
    self.setFocus()


def main():

app = QtGui.QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())


if __name__ == '__main__':
   main()

错误是这样的：

File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 169, 
in <module> main() 
File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 164, 
in main ex = Example() 
File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 132, 
in __init__ self.initUI() 
File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 146, 
in initUI self.p = Screen() 
File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 104, 
in __init__ self.ex = Example()#<------------------------------------------------ 
The problem File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 132, 
in __init__ self.initUI() 
File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 146, 
in initUI self.p = Screen() 
File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 104, in __init__ self.ex = Example()#<------------------------------------------------ The problem File "C:\Users\Marc\Desktop\GarciaMarcSerp1.py", line 132, in __init__

任何帮助将不胜感激

Answer 1

在构造对象时似乎有无限递归。每个Screen实例都尝试创建Example实例以存储在self.example中，但每个Example实例都会尝试创建Screen实例以存储在self.p中}}。最终Python达到递归限制并放弃，引发异常，就像你部分引用的一样。

您需要打破对象创建的循环。也许您的Example类可以将Screen对象作为__init__的参数？然后Screen可以将自己作为该对象传递。

这是一些显示我的意思的快速代码：

class Screen(QtGui.QWidget):
    def __init__(self):
        # other init stuff
        self.example = Example(self)     # pass self to the Example constructor

    # other methods


class Example(QtGui.QWidget):
    def __init__(self, screen):          # take screen as a parameter
        super(Example, self).__init__()
        self.initUI(screen)              # pass it along to initUI

    # other methods, etc

    def initUI(self, screen):            # take screen as a parameter
        self.p = screen                  # use the passed screen rather than creating one

        # do other stuff with self.p, same as before

当我调用其他对象时，我的对象会丢失错误

1 个答案: