Reputation: 146
I am trying to make an instant messenger with multiple frames and have incorporated some code from a tutorial I have been following. My entry "e" is supposed to save the user input in a text file and display it in a text box however when I call e.get() I get the following error. It is treating e as an attribute instead of an object (I think) and I don't know why.
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\Douglas Rouse\AppData\Local\Programs\Python\Python35-32\lib\idlelib\run.py", line 119, in main
seq, request = rpc.request_queue.get(block=True, timeout=0.05)
File "C:\Users\Douglas Rouse\AppData\Local\Programs\Python\Python35-32\lib\queue.py", line 172, in get
raise Empty
queue.Empty
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Douglas Rouse\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1550, in __call__
return self.func(*args)
File "C:\Users\Douglas Rouse\Google Drive\Python\New structure.py", line 78, in callback
f.write("Douglas:"+self.e.get()+"\n")
AttributeError: 'PageOne' object has no attribute 'e'
I can't tell why it thinks e is an attribute or why it can't call e (the entry) as an object and not the class itself. Here is the code I am working on. the error is in the callback function.
import tkinter as tk
LARGE_FONT=("Verdana", 12)
class SeaofBTCapp(tk.Tk):
def __init__(self, *args, **kwargs):
tk.Tk.__init__(self, *args, **kwargs)
container = tk.Frame(self)
container.grid()
container.grid_rowconfigure(0, weight=1)
container.grid_columnconfigure(0, weight=1)
self.frames = {}
frame = StartPage(container, self)
frame_ = PageOne(container, self)
self.frames[StartPage] = frame
self.frames[PageOne] = frame_
frame.grid(row=0, column=0, sticky="nsew")
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,*args):
tk.Frame.__init__(self, parent)
usrlabel = tk.Label(self, text="Input Username", font=LARGE_FONT)
usrlabel.grid(pady=10,padx=10)
usrentry = tk.Entry(self)
#usrentry.grid()
global uu
uu = usrentry.get()
#command within button cant throw args to funcs. Use lambda to throw those args to the func instead
button1 = tk.Button(self, text="Visit Page 1",command=
lambda: controller.show_frame(PageOne))
button1.grid()
class PageOne(tk.Frame):
def __init__(self, parent, controller):
tk.Frame.__init__(self, parent)
label = tk.Label(self, text="Page 1", font=LARGE_FONT)
label.grid()
#command within button cant throw args to funcs. Use lambda to throw those args to the func instead
button1 = tk.Button(self, text="Start Page",command=lambda:controller.show_frame(StartPage))
button1.grid()
file = open("htfl.txt","r") #opens file
#print(file.read(1))
a = file.read()
b = file.read()
print(file.read())
#entry
e = tk.Entry(self,width= 40)
e.grid(row=10,column=0,sticky = "W")
#text
T = tk.Text(self, height=9, width=30)
T.grid(row=3,column= 0)
#T.insert(END,a)
b = tk.Button(self, text="Send", width=10, command=self.callback).grid(row=10,column=2)
def callback(self,*args):
f = open("htfl.txt","a")
f.write("Douglas:"+self.e.get()+"\n")
e.delete(0, 'end')
#print (e.get())
#Button
app = SeaofBTCapp()
Upvotes: 0
Views: 82
Reputation: 1759
The e
you're creating in PageOne
's __init__
method is a local variable and can't be referenced from the outside. What you want to do is to make e
an attribute of your object. This will result in
self.e = tk.Entry(self,width= 40)
If you now want to access this attribute in your object, use self.e
instead of e
.
self.e.grid(row=10,column=0,sticky = "W")
# -skipped-
f.write("Douglas:"+self.e.get()+"\n")
# -skipped-
self.e.delete(0, 'end')
Upvotes: 1