Attribute error: Error says new attribute doesn't exist even though it does

Question

My news attribute can't be called by a function as it says it doesn't exist as an attribute in the class.

I have tried a lot of tutorials but none seem it include a class.

from tkinter import *


class Interface(Frame):
    def __init__(self, parent, *args, **kwargs):
        Frame.__init__(self, parent, *args, **kwargs)
        self.parent = parent

        self.master.title("Travel Information")

        # Labels
        self.main_label = Label(text="Travel Information", font='Helvetica 18 bold')
        self.main_label.grid(column=1, row=0)

        self.desc_label = Label(text="This program will gather a variety of information\n on a "
                                     "location of the users choice.")
        self.desc_label.grid(column=0, row=1, columnspan=3)

        self.entry_label = Label(text="Enter the location:")
        self.entry_label.grid(column=0, row=2, sticky=W)

        # Entries
        self.location_entry = Entry()
        self.location_entry.grid(column=1, row=2, pady=5, padx=6, sticky=W+E)

        # Buttons
        self.location_submit_button = Button(text="Submit", width=10, command=self.get_location())
        self.location_submit_button.grid(column=2, row=2, pady=20)

        self.quit_button = Button(text="Quit", command=quit)
        self.quit_button.grid(column=1, row=7)

        # Check Buttons
        self.weather = IntVar()
        self.weather_checkbutton = Checkbutton(text="Weather Info", variable=self.weather)
        self.weather_checkbutton.grid(column=1, row=3, sticky=W)

        self.tourist = IntVar()
        self.tourist_checkbutton = Checkbutton(text="Tourist Info", variable=self.tourist)
        self.tourist_checkbutton.grid(column=1, row=4, sticky=W)

        self.transport = IntVar()
        self.transport_checkbutton = Checkbutton(text="Transport Info", variable=self.transport)
        self.transport_checkbutton.grid(column=1, row=5, sticky=W)

        self.news = IntVar()
        self.news_checkbutton = Checkbutton(text="News Info", variable=self.news)
        self.news_checkbutton.grid(column=1, row=6, sticky=W)

    # Logic Functions (To be moved)

    def get_location(self):
        location = self.location_entry.get()
        news = self.news.get()
        transport = self.transport.get()
        tourist = self.tourist.get()
        weather = self.weather.get()
        print(location)

        if news == 0 and transport == 0 and tourist == 0 and weather == 0:
            print("None Selected Working")

        elif news == 0 and transport == 0 and tourist == 0 and weather == 1:
            print("Weather working")

        elif news == 0 and transport == 0 and tourist == 1 and weather == 0:
            print("Tourist Working")

        elif news == 0 and transport == 0 and tourist == 1 and weather == 1:
            print("Tourist and Weather working")

        elif news == 0 and transport == 1 and tourist == 0 and weather == 0:
            print("Transport working")

        else:
            print()

        return location

root = Tk()
root.geometry("")
app = Interface(root)
root.mainloop()

The Error: Traceback (most recent call last):

  File "C:/Users/Scott/Desktop/Individual Project/IndProj.py", line 89, in <module>
    app = Interface(root)
  File "C:/Users/Scott/Desktop/Individual Project/IndProj.py", line 32, in __init__
    self.location_submit_button = Button(text="Submit", width=10, command=self.get_location())
  File "C:/Users/Scott/Desktop/Individual Project/IndProj.py", line 59, in get_location
    news = self.news.get()
AttributeError: 'Interface' object has no attribute 'news'

I expected the function to bring the travel, news, tourist and weather variables into the function to be used in the if statement.

Could you please include the error traceback in your question? — funie200, May 06 '19 at 12:48
It is because you passed `self.get_location()` to command option of `location_submit_button`, and `self.news` has not yet created at that moment. You should pass the reference of the function instead. — acw1668, May 06 '19 at 12:55
For some reason the function runs as the button is generated and not when I click the button. Would you know why? — Scotto, May 06 '19 at 13:04
@Scotto it's because you typed `self.get_location()` which is a call to the function. — Amine Messaoudi, May 06 '19 at 13:07

score 0 · Accepted Answer · edited May 06 '19 at 13:13

0

What happened is that Python threw an an exception at that line which broke the execution of the code so the news variable was not set

change

self.location_submit_button = Button(text="Submit", width=10, command=self.get_location())

into

self.location_submit_button = Button(text="Submit", width=10, command=self.get_location)

edited May 06 '19 at 13:13

Lee

1,427
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answered May 06 '19 at 13:02

Amine Messaoudi

2,141
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37

Attribute error: Error says new attribute doesn't exist even though it does

1 Answers1