如何在python中调用不同类中的方法，而该类位于不同的文件中？

Question

我有一个名为main.py的文件，其中包含一个名为mainWindow的类。我还有一个名为popupWindow.py的文件，其中包含一个名为popupWindow的类。mainWindow类包含2个方法。一个名为clearListBox的函数用于清除主窗口中的列表框，另一个名为addScouts(I)的函数用于将存储在文件中的侦察兵写入列表框。我想能够从我的类popupWindow调用clearListBox和addScouts(I)。我如何做到这一点？你知道吗

在尝试from main import mainWindow然后调用mainWindow.addScouts(1)时，我收到了错误addScouts需要arg self

在我的main.py文件中：

class mainWindow:
    def __init__(self,master):
        self.master = master
        self._scouts = []
        addBtn = Button(master,text="Create Scout",command=self._createScout)
        addBtn.pack()
        remBtn = Button(master,text="Remove Scout",command=self._removeScout)
        remBtn.pack()
        fndBtn = Button(master,text="Find Scout",command=self._findScout)
        fndBtn.pack()
        exitBtn = Button(master,text="Exit",command=self._exit)
        exitBtn.pack()
        scoutList = Listbox(master)
        scoutList.pack()
        self.scoutList = scoutList
        self.addScouts(1)
        w = 1000 #The value of the width
        h = 750 #The value of the height of the window

        # get screen width and height
        ws = root.winfo_screenwidth()#This value is the width of the screen
        hs = root.winfo_screenheight()#This is the height of the screen

        # calculate position x, y
        x = (ws/2) - (w/2)
        y = (hs/2) - (h/2)

        #This is responsible for setting the dimensions of the screen and where it is
        #placed
        root.geometry('%dx%d+%d+%d' % (w, h, x, y))
        self._createLeaderboard()

    def addScouts(self,I):
        i = I
        with open(fileName,"r") as f:
            lines = f.readlines()
            for line in lines:
                if str(line.split(",")[3])[:-1] == str(i):
                    self.scoutList.insert(END,line[:-1])
                    i += 1
                    return self.addScouts(i)
        return

    def clearListBox(self):
        self.scoutList.delete(0,END)
        return

在popupWindow.py中：

from main import mainWindow

在popupWindow类中：

mainWindow.clearListBox()
mainWindow.addScouts(1)

我的错误：

Traceback (most recent call last):
  File "C:\Users\KRIS\Documents\Python Projects\Scouts\popupWindow.py", line     4, in <module>
    from main import mainWindow
  File "C:\Users\KRIS\Documents\Python Projects\Scouts\main.py", line 4, in     <module>
    from popupWindow import *
  File "C:\Users\KRIS\Documents\Python Projects\Scouts\popupWindow.py", line 4, in <module>
    from main import mainWindow
ImportError: cannot import name 'mainWindow'

先谢谢你

Answer 1

在popupWindow.py的开头，把

from main import mainWindow

然后你可以打电话，例如mainWindow.clearListBox()

发布代码后编辑示例： clearListBox是一个实例方法，因此只能在实例上调用，而不能在类本身上调用。首先必须实例化mainWindow类型的对象。你知道吗