Python Can';t访问来自其他类的变量-tkinter
我正试图在tkinter中编写一个程序,用户点击一个带有他们名字的按钮,一个验证页面会显示给他们。我遇到的问题是变量正在重置,或者我访问它时出错:Python Can';t访问来自其他类的变量-tkinter,python,variables,python-3.x,tkinter,Python,Variables,Python 3.x,Tkinter,我正试图在tkinter中编写一个程序,用户点击一个带有他们名字的按钮,一个验证页面会显示给他们。我遇到的问题是变量正在重置,或者我访问它时出错: import tkinter as tk from tkinter import * from tkinter import ttk LARGE_FONT = ("Times New Roman", 12) NORM_FONT = ("Times New Roman", 10) root = Tk() root.withdraw() class
import tkinter as tk
from tkinter import *
from tkinter import ttk
LARGE_FONT = ("Times New Roman", 12)
NORM_FONT = ("Times New Roman", 10)
root = Tk()
root.withdraw()
class DIS(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
tk.Tk.iconbitmap(self, default="")
tk.Tk.wm_title(self, "program")
container = tk.Frame(self)
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 (StartPage, contactQues, nameVerify):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row = 0, column = 0, sticky = "nsew")
self.show_frame(StartPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
button2 = ttk.Button(self, text = "Name Select",
command=lambda: controller.show_frame(contactQues))
button2.pack()
class contactQues(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
global name
name = StringVar()
label1 = tk.Label(self, text = "Select Your Name", font = LARGE_FONT)
label1.pack(pady=10, padx=10)
button2 = ttk.Button(self, text = "Bojangles", command = self.bojangles)
button2.pack(pady=5)
def bojangles(self):
name.set("Mr. Bojangles")
self.controller.show_frame(nameVerify)
#
#Many other names to select
#
class nameVerify(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
namename = name.get()
label5 = tk.Label(self, text = "Your Name:", font = LARGE_FONT)
label5.pack(pady=10, padx=10)
labelcontact = tk.Label(self, text = namename, font = NORM_FONT)
labelcontact.pack()
app = DIS()
app.mainloop()
因此,本质上,我希望发生的是:
-程序运行,用户按“名称选择”,用户选择其名称,最后一页显示其选择
我尝试过处理全局变量、labelcontact
label的textvariables、StringVar()等,但似乎无法确定这一点
有更好的方法吗?还是我做了一些天生错误的事情
谢谢您的帮助。我建议将
name
作为DIS
类的一个属性。然后,您的StartPage和nameVerify实例可以通过其控制器属性访问它。如果希望labelcontact
在name
时自动更新,请使用textvariable
属性
此外,您需要删除root=Tk()
和root.draw()
行。我不知道为什么,但只要它们在那里,labelcontact标签就不会正确更新。在任何情况下,它们似乎都不会做任何事情——希望它们对您的实际代码不是至关重要的
import tkinter as tk
from tkinter import *
from tkinter import ttk
LARGE_FONT = ("Times New Roman", 12)
NORM_FONT = ("Times New Roman", 10)
class DIS(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
tk.Tk.iconbitmap(self, default="")
tk.Tk.wm_title(self, "program")
container = tk.Frame(self)
container.pack(side="top", fill="both", expand = True)
container.grid_rowconfigure(0, weight = 1)
container.grid_columnconfigure(0, weight = 1)
self.name = StringVar()
self.frames = {}
for F in (StartPage, contactQues, nameVerify):
frame = F(container, self)
self.frames[F] = frame
frame.grid(row = 0, column = 0, sticky = "nsew")
self.show_frame(StartPage)
def show_frame(self, cont):
frame = self.frames[cont]
frame.tkraise()
class StartPage(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
button2 = ttk.Button(self, text = "Name Select",
command=lambda: controller.show_frame(contactQues))
button2.pack()
class contactQues(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label1 = tk.Label(self, text = "Select Your Name", font = LARGE_FONT)
label1.pack(pady=10, padx=10)
button2 = ttk.Button(self, text = "Bojangles", command = self.bojangles)
button2.pack(pady=5)
def bojangles(self):
self.controller.name.set("Mr. Bojangles")
self.controller.show_frame(nameVerify)
#
#Many other names to select
#
class nameVerify(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
self.controller = controller
label5 = tk.Label(self, text = "Your Name:", font = LARGE_FONT)
label5.pack(pady=10, padx=10)
labelcontact = tk.Label(self, textvariable = self.controller.name, font = NORM_FONT)
labelcontact.pack()
app = DIS()
app.mainloop()
我意识到我本可以把它缩短一点。我的错。是的,请缩短这个。请详细描述未正确设置的内容:“标签”是不够的,因为程序中有几个标签。还放入一些打印语句,以跟踪有问题的值;这可能显示错误的流程。这是一个有趣的问题。。。我最初认为用textvariable=name
切换text=namename
是一个非常简单的修复方法,这应该会导致labelcontact在name
时自动更新。但由于某些原因,它不是gui上的.Trace变量,而是在另一个类函数中。我从来没有想过这一点。我尝试了globalname
和所有东西,但从未接触过DIS.
它似乎像预期的那样工作--非常感谢+1re:“此外,您需要删除root=Tk()和root.draw()行。我不知道为什么。”-之所以“为什么”是因为DIS
是Tk
的一个子类,而tkinter程序应该只有一个Tk
@BryanOakley的实例。我确实有一种感觉与此有关。我不得不添加它,以使整个程序的其他部分正常工作,但我稍后将返回到该部分,并查看如何在没有第二个实例的情况下解决该问题。谢谢你的澄清。