将变量从一个函数传递到同一类中的另一个函数？

Question

I'm trying to create a button that changes colors on click.

After digging around in an old Python book I haven't looked at in years, I've gotten to the point where I make the the button, but I can't figure out how to pass i into the second function so it increments and is then is reset to 0 .

I suppose I could just increment I on click in the first function, but now I'm annoyed and want to figure it out.

Instead of self.change_color I tried change_color(i) . That threw an error. Same with trying self.change_color(i) .

I'm not sure what to do at this point.

import tkinter

class joeGUI:
    def __init__(self):

        i = 0
        colorArray = ['blue','DarkGreen','red','yellow']

        self.main_window = tkinter.Tk()

        self.color_button = tkinter.Button(self.main_window,
                                           text = 'Click to Change Color',
                                           command = self.change_color,
                                           bg = colorArray[i])
        self.color_button.pack()
        tkinter.mainloop()

    def change_color(self):
        if (count < 3):
            count += 1
        else:
            count = 0
        return count;


joe_gui = joeGUI()

Answer 1

将i存储为类属性（ self.i = 0 ），并将count的引用更改为self.i