Tkinter通过类变量调用类中的函数

Question

我正在使用Tkinter并尝试在类中调用函数，但不能让它正常工作。

class Access_all_elements:

        def refSelect_load_file(self): 

            self.reffname = askopenfilename(filetypes=(("XML files", "*.xml"),
                                                       ("All files", "*.*") ))
            if self.reffname:
                fileOpen = open(self.reffname)

        refSelect = Button(topFrame, text="Open Reference File", 
                    command=lambda:refSelect_load_file(self), bg = "yellow")
        refSelect.grid(row =1, column=1)

错误：

执行上述命令时，按下按钮后出现以下错误：

NameError: global name 'refSelect_load_file' is not defined

我尝试了什么：

我尝试使用tkinter的通用方法调用函数，这对我来说不起作用。

refSelect = Button(topFrame, text="Open Reference File", 
                        command=refSelect_load_file, bg = "yellow")
refSelect.grid(row =1, column=1)

这引发了我的错误：

TypeError: refSelect_load_file() takes exactly 1 argument (0 given)

你们可以在这里建议我吗？

Answer 1

使用self.

调用该函数时，您的问题将得到解决

refSelect = Button(topFrame, text="Open Reference File", 
                    command=self.refSelect_load_file, bg = "yellow")

修改
试试这个。

class Access_all_elements():
    def __init__(self):
        refSelect = Button(topFrame, text="Open Reference File", 
                command=lambda:self.refSelect_load_file, bg = "yellow")
        refSelect.grid(row =1, column=1)


    def refSelect_load_file(self): 

        self.reffname = askopenfilename(filetypes=(("XML files", "*.xml"),
                                                   ("All files", "*.*") ))
        if self.reffname:
            fileOpen = open(self.reffname)

最终修改

from tkinter import *
from tkinter import filedialog


class Access_all_elements():

    def __init__(self):
        refSelect = Button(root, text="Open Reference File",command=self.refSelect_load_file, bg = "yellow")
        refSelect.grid(row =1, column=1)

    def refSelect_load_file(self): 
        self.reffname = filedialog.askopenfilename(filetypes=(("XML files", "*.xml"), ("All files", "*.*") ))
        if self.reffname:
            fileOpen = open(self.reffname)

root = Tk()
Access_all_elements()
root.mainloop()