在Python中的类中更改变量字符串 [英] Changing a Variablestring in a Class in Python

问题描述

我只有一小段代码，可以很好地工作，直到我决定创建一个类并将其放入该类中为止.现在我的问题是，我无法再更改stringvariable.

I have a small piece of code, which was working fine, until I decided to create a class and put things into that class. Now my problem is, I cannot change stringvariable anymore.

这是我的代码:

import tkinter     as tk
import tkinter.ttk as ttk

class MainApplication(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        tk.Frame.__init__(self, parent, *args, **kwargs)
        self.parent = parent
        
        frame1 = ttk.LabelFrame(root, text="PANEL A", borderwidth=5)
        frame1.grid(row=0, column=0, padx=5, pady=5)

        frame2 = ttk.LabelFrame(frame1, text="PANEL B", width = 500, height = 1000)
        frame2.grid(row=0, column=0, padx=5, pady=5, sticky='NSWE')

        strVarMeasurement = tk.StringVar()

        frame3 = ttk.LabelFrame(frame2, text="PANEL C")
        frame3.grid(row=0, column=0, padx=5, pady=5)
        lbl_01 =    ttk.Label(frame3, width=20, anchor = tk.E, text="Measurement: ").grid(row=0, column=0)
        e_01 =      ttk.Entry (frame3, width=8, textvariable=strVarMeasurement).grid(row=0, column=1)


    def setString():
        strVarMeasurement.set(1234)

if __name__ == "__main__":
    root = tk.Tk()
    MainApplication(root)
    MainApplication.setString()
    root.mainloop()

这是我得到的错误: NameError:名称'strVarMeasurement'未定义

如何更改该类的字符串?这个变量不是在 MainApplication(root)期间创建的吗?您认为在类的内部或外部定义这样的字符串更好吗?

How can I change that string of the class? Isn't that variable created during MainApplication(root)? Do you think it is better to define such a string inside or outside the class?

推荐答案

添加 self 和Object，这可能会解决此错误.

Add self and and Object, this may fix this error.

import tkinter     as tk
import tkinter.ttk as ttk

class MainApplication(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        tk.Frame.__init__(self, parent, *args, **kwargs)
        self.parent = parent
        
        frame1 = ttk.LabelFrame(root, text="PANEL A", borderwidth=5)
        frame1.grid(row=0, column=0, padx=5, pady=5)

        frame2 = ttk.LabelFrame(frame1, text="PANEL B", width = 500, height = 1000)
        frame2.grid(row=0, column=0, padx=5, pady=5, sticky='NSWE')

        self.strVarMeasurement = tk.StringVar()

        frame3 = ttk.LabelFrame(frame2, text="PANEL C")
        frame3.grid(row=0, column=0, padx=5, pady=5)
        lbl_01 =    ttk.Label(frame3, width=20, anchor = tk.E, text="Measurement: ").grid(row=0, column=0)
        e_01 =      ttk.Entry (frame3, width=8, textvariable= self.strVarMeasurement).grid(row=0, column=1)

    def setString(self):
        self.strVarMeasurement.set(1234)

if __name__ == "__main__":
    root = tk.Tk()
    app = MainApplication(root)
    app.setString()
    root.mainloop()

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