Python 从另一个类引用变量 我根据我最初发布的内容编辑了我的代码。我用了一个过于简单的例子。我正在CalcVar类中向字典添加“my dict”，并希望在“display Var”页面上显示更新后的值。

我在下面提供了我的代码。没有错误，但它没有按我所希望的方式执行。在“Display Var”类中，我显示了myvar的输出。我希望它显示两个标签，一个写着‘dict 1’，另一个写着‘dict 2’。现在它只提取“dict 1”的原始值。程序的第一步是转到Calc Var页面，我将'dict 2'添加到mydict。从那里我想转到“Display Var”页面，并显示编辑过的词典，以便它显示“dict 1”和“dict 2”，但它只显示为“dict 1”。我如何让它显示为“dict 1”和“dict 2”

非常感谢您的帮助

import tkinter as tk

LARGE_FONT= ("Times New Roman", 22)


class MyApp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        global mydict
        mydict = {'dict1' : {"a b c" : 123}} # set its value


        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}

        for F in (CalcVar, DisplayVar):

            frame = F(container, self)

            self.frames[F] = frame

            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(CalcVar)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()


class CalcVar(tk.Frame):

    def __init__(self, parent, controller):

        tk.Frame.__init__(self,parent)


        def addvar():
            global mydict
            #myvar.set(myvar.get()+" c") # when add the value.
            dict2 = {'d e f' : 456}
            mydict['dict 2'] = dict2
            print(mydict)



        label = tk.Label(self, text="Calculation Page", font=LARGE_FONT)
        label.pack(pady=10,padx=10)



        button = tk.Button(self, text="Display Results",
                            command=lambda: controller.show_frame(DisplayVar))
        button.pack()


        calcbutton = tk.Button(self, text="AddVar",
                            command=addvar)
        calcbutton.pack()



class DisplayVar(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        global mydict

        for x, y in mydict.items():
            label = tk.Label(self, text=x, font=LARGE_FONT) 
            label.pack(pady=10,padx=10)


        button1 = tk.Button(self, text="Back to Calculation Page",
                            command=lambda: controller.show_frame(CalcVar))
        button1.pack()

---

您的问题不是引用另一个类中的变量。第一次运行时，文本为a，b。即使您下次调用addvar，标签中的文本也不会更改。您可以使用textvariable而不是label小部件中的文本

然后是您的代码：

import tkinter as tk

LARGE_FONT= ("Verdana", 12)

class MyApp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        global myvar # global
        myvar = tk.StringVar() # create a StringVar and assign it myvar
        myvar.set("a b") # set its value

        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)
        self.frames = {}
        for F in (CalcVar, DisplayVar):
            frame = F(container, self)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame(CalcVar)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()

class CalcVar(tk.Frame):

    def __init__(self, parent, controller):

        tk.Frame.__init__(self,parent)

        def addvar():
            global myvar
            myvar.set(myvar.get()+" c") # when add the value.
            print(myvar.get())

        label = tk.Label(self, text="Calculation Page", font=LARGE_FONT)
        label.pack(pady=10,padx=10)
        button = tk.Button(self, text="Display Results",
                            command=lambda: controller.show_frame(DisplayVar))
        button.pack()

        calcbutton = tk.Button(self, text="AddVar",
                            command=addvar)
        calcbutton.pack()

class DisplayVar(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        global myvar

        label = tk.Label(self, textvariable=myvar, font=LARGE_FONT) # bind a textvariable not text
        label.pack(pady=10,padx=10)
        button1 = tk.Button(self, text="Back to Calculation Page",
                            command=lambda: controller.show_frame(CalcVar))
        button1.pack()

app = MyApp()
app.geometry('750x500')

app.mainloop()

编辑：即使您想使用dict，原理也是一样的。最简单的方法是使用textvaribale。但是如果您想在dict中显示字符串，只需使用myvar.setxx进行设置

import tkinter as tk

LARGE_FONT= ("Verdana", 12)

class MyApp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        global myvar,mydict # global
        mydict = {'dict 1' : {"a b c" : 123}}
        myvar = tk.StringVar() # create a StringVar and assign it myvar
        myvar.set(" ".join(i for i in mydict)) # set "dict 1" string

        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)
        self.frames = {}
        for F in (CalcVar, DisplayVar):
            frame = F(container, self)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame(CalcVar)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()

class CalcVar(tk.Frame):

    def __init__(self, parent, controller):

        tk.Frame.__init__(self,parent)

        def addvar():
            global myvar,mydict
            dict2 = {'d e f' : 456}
            mydict['dict 2'] = dict2 # add it to your dict
            myvar.set(" ".join(i for i in mydict)) # also set the vale and show it.
            print(myvar.get())

        label = tk.Label(self, text="Calculation Page", font=LARGE_FONT)
        label.pack(pady=10,padx=10)
        button = tk.Button(self, text="Display Results",
                            command=lambda: controller.show_frame(DisplayVar))
        button.pack()

        calcbutton = tk.Button(self, text="AddVar",
                            command=addvar)
        calcbutton.pack()

class DisplayVar(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        global myvar

        label = tk.Label(self, textvariable=myvar, font=LARGE_FONT) # bind a textvariable not text
        label.pack(pady=10,padx=10)
        button1 = tk.Button(self, text="Back to Calculation Page",
                            command=lambda: controller.show_frame(CalcVar))
        button1.pack()

app = MyApp()
app.geometry('750x500')

app.mainloop()

我强烈建议您只使用\n来加入它们。如果您真的想创建两个标签小部件，这非常简单快速。这可能不是最好的方法：

import tkinter as tk

LARGE_FONT= ("Verdana", 12)

class MyApp(tk.Tk):

    def __init__(self, *args, **kwargs):

        tk.Tk.__init__(self, *args, **kwargs)
        container = tk.Frame(self)

        global mydict # global
        mydict = {'dict 1' : {"a b c" : 123}}

        container.pack(side="top", fill="both", expand = True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)
        self.frames = {}
        for F in (CalcVar, DisplayVar):
            frame = F(container, self)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame(CalcVar)

    def show_frame(self, cont):

        frame = self.frames[cont]
        frame.tkraise()

class CalcVar(tk.Frame):

    def __init__(self, parent, controller):

        tk.Frame.__init__(self,parent)

        def addvar(p,c):
            global mydict
            for i in p.winfo_children()[0].winfo_children(): # delete all the widget in the displayVar
                i.pack_forget()
            mydict['dict 2']={'d e f':456}
            for i in mydict: # then pack them in it.
                tk.Label(p.winfo_children()[0],text=i).pack(pady=10,padx=10)
            button1 = tk.Button(p.winfo_children()[0], text="Back to Calculation Page",
                                command=lambda: c.show_frame(CalcVar))
            button1.pack()

        label = tk.Label(self, text="Calculation Page", font=LARGE_FONT)
        label.pack(pady=10,padx=10)
        button = tk.Button(self, text="Display Results",
                            command=lambda: controller.show_frame(DisplayVar))
        button.pack()

        calcbutton = tk.Button(self, text="AddVar",
                            command=lambda :addvar(parent,controller))
        calcbutton.pack()

class DisplayVar(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        global mydict

        for i in mydict:
            print(i)
            tk.Label(self, text=i).pack(pady=10, padx=10)
        button1 = tk.Button(self, text="Back to Calculation Page",
                            command=lambda: controller.show_frame(CalcVar))
        button1.pack()

app = MyApp()
app.geometry('750x500')

app.mainloop()

---

谢谢，非常有帮助。如果myvar是一个字典而不是一个字符串呢？我编辑了我的原始代码以显示为字典。我试着按照你的建议去做，但是我仍然没有得到我想要的结果。非常感谢你的回复。非常有帮助，非常感谢！你只想让它显示dict1和dict2？很抱歉混淆了，我的示例变得混乱了。我想在“DisplayVar”选项卡上创建两个标签。一个标签上写着dict1，另一个标签上写着dict2。实际上，最终，我希望在“mydict”中有数量可变的字典，“DisplayVar”页面将创建一个标签，其中包含每个字典的名称。尝试使用字符串变量执行此操作时出现错误。您的代码有点难读。您可以在visual中将其设置为两个标签。请使用\n在dict中连接键。