我开始学习Python和tkinter包,我正在编写一个程序来加载GUI窗口上的文本文件。要打开文件浏览器,我安装了按钮及其必要的功能,如下面的代码所示。程序运行但是当我点击“浏览”按钮时,我收到一个属性错误说:“'assign_1'对象没有属性'var_filename'”。如果有人能帮助我,那就太棒了。
from tkinter import *
from tkinter import messagebox
from tkinter import simpledialog
from tkinter import filedialog
from math import *
from numpy import *
import string
root = Tk()
def close_window_callback(root):
if messagebox.askokcancel("Quit", "Do you really wish to quit?"):
root.destroy()
class assign_1:
def __init__(self,master):
self.master = master
frame = Frame(master)
frame.pack()
self.canvas = Canvas(master,width=1000,height=1000, bg="yellow")
self.button_browse = Button(frame, text="Browse",
command=self.browse_file)
self.button_browse.pack()
self.button_load = Button(frame, text="Load")
self.button_load.pack(side = LEFT)
self.canvas.pack(expand=YES, fill=BOTH)
def browse_file(self):
self.var_filename.set(filedialog.askopenfilename(filetypes=[("allfiles","*"),("pythonfiles","*.txt")]))
filename = self.var_filename.get()
print(filename)
root.protocol("WM_DELETE_WINDOW", lambda root_window=root: close_window_callback(root_window))
assign_1(root)
root.mainloop()
答案 0 :(得分:1)
缩进是错误的。您想要定义为类browse_file
的方法的函数assign_1
(使用大写字母来声明类的名称)是您定义的全局函数。
您还没有在任何地方定义self.var_filename
,因此它会给您错误:
AttributeError: 'assign_1' object has no attribute 'var_filename'
在close_window_callback
函数下,您还有错误的缩进。
答案 1 :(得分:1)
虽然正如Rinzler所指出的那样,您发布的代码中的缩进 错误,但这会导致另一个错误(AttributeError: assign_1 instance has no attribute 'browse_file'
)。所以我猜你实际使用的代码中的缩进是正确的。
问题是您尝试使用self.var_filename.set(...)
而未定义self.var_filename
。如果您希望它是StringVar
,因为您使用set
和get
似乎就是这种情况,您必须对其进行初始化。为此,您应将self.var_filename = StringVar(master)
放入“__init__
类”功能中。一个小例子证明了这一点:
root = Tk()
class assign_1:
def __init__(self, master):
self.master = master
self.var_filename = StringVar(master)
self.button_browse = Button(master, text="Browse", command=self.browse_file)
self.button_browse.pack()
def browse_file(self):
self.var_filename.set(filedialog.askopenfilename(filetypes=[("allfiles","*"),("pythonfiles","*.txt")]))
filename = self.var_filename.get()
print(filename)
assign_1(root)
root.mainloop()
但是,从它的外观来看,在你的情况下不需要使用tkinter StringVar,只需使用普通的字符串变量:
root = Tk()
class assign_1:
def __init__(self, master):
self.master = master
self.button_browse = Button(master, text="Browse", command=self.browse_file)
self.button_browse.pack()
def browse_file(self):
self.filename = filedialog.askopenfilename(filetypes=[("allfiles","*"),("pythonfiles","*.txt")])
print(self.filename)
assign_1(root)
root.mainloop()