Create a program in Python that finds the pythagorean theorem with a GUI

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'm struggling with a bit of code for my final Intro to programming in Python homework. The goal is to build a small GUI that calculates the hypotenuse of a right triangle after the user enters the length of 2 sides and hits calculate. I've written a lot of the code but i'm struggling in 2 ways. 1. The "Side C" box shouldn't be a box you can enter stuff into, instead it should be blank until the answer comes up in it, but i'm not sure how to do that. 2. I keep getting an error:
> AttributeError: 'Pythagorean' object has no attribute 'ans'

import tkinter
import math
class Pythagorean:
    def __init__(self):
        # Create the main window.
        self.main_window = tkinter.Tk()

        # Create the five frames.
        self.SideA_frame = tkinter.Frame(self.main_window)
        self.SideB_frame = tkinter.Frame(self.main_window)
        self.SideC_frame = tkinter.Frame(self.main_window)
        self.ans_frame = tkinter.Frame(self.main_window)
        self.button_frame = tkinter.Frame(self.main_window)

        
        self.SideA_label = tkinter.Label(self.SideA_frame,
                                         text='   Side A:')
        self.SideA_entry = tkinter.Entry(self.SideA_frame,
                                         width=30)
        self.SideA_label.pack(side='left')
        self.SideA_entry.pack(side='left')

        
        self.SideB_label = tkinter.Label(self.SideB_frame,
                                         text='   Side B:')
        self.SideB_entry = tkinter.Entry(self.SideB_frame,
                                         width=30)
        self.SideB_label.pack(side='left')
        self.SideB_entry.pack(side='left')
        
        
        self.SideC_label = tkinter.Label(self.SideC_frame,
                                         
                                         text='   Side C:')
        self.SideC_entry = tkinter.Entry(self.SideC_frame,
                                         width=30)
        self.SideC_label.pack(side='left')
        self.SideC_entry.pack(side='left')


        
        self.calc_button = tkinter.Button(self.button_frame,
                                          text='Calculate',
                                          command=self.calc_ans)
        self.quit_button = tkinter.Button(self.button_frame,
                                          text='Exit',
                                          command=self.main_window.destroy)
        self.calc_button.pack(side='right')
        self.quit_button.pack(side='right')

        
        self.SideA_frame.pack()
        self.SideB_frame.pack()
        self.SideC_frame.pack()
        self.ans_frame.pack()
        self.button_frame.pack()

        
        tkinter.mainloop()
    
    def calc_ans(self):
        
        self.SideA = float(self.SideA_entry.get())
        self.SideB = float(self.SideB_entry.get())
        
        self.Pyth =  math.sqrt(self.SideA**2 + self.SideB**2)       
        self.ans.set(self.Pyth)
        
Pyth_The = Pythagorean()

What I have tried:

I've tried modifying various parts of the code, looking up guides on Tkinter and classes, but to no avail i still cant figure out these issues. I feel really lost on this project.

Posted 24-Apr-18 20:50pm

Member 13796964

Updated 30-Jul-19 17:56pm

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User 7429338 · Answer 1 · 2018-04-24T21:13:00

Solution 1

For your first problem, you could make the field read only:

self.SideC_entry.configure(state='readonly')

Posted 24-Apr-18 21:13pm

User 7429338

Comments

Member 13796964 25-Apr-18 3:39am

Thank you very much for your help! Now just to keep playing around till i crack the AttributeError

Richard MacCutchan · Answer 2 · 2018-04-24T21:39:00

Solution 2

Python

self.ans.set(self.Pyth)

You are trying to call the set method on an object that has never been declared.

Posted 24-Apr-18 21:39pm

Richard MacCutchan

Comments

Member 13796964 25-Apr-18 3:53am

Thank you, i'm still new to Object Oriented programming, and adding in Tkinter hasn't been helping. My prof didn't really go into Tkinter much, so I've been very lost.

Richard MacCutchan 25-Apr-18 4:16am

That is nothing to do with Tkinter. You cannot call a method on an object that does not exist. self.ans is not a class object so does not have a set method.

Member 14546211 · Answer 3 · 2019-07-30T17:56:00

For side c this needs to be added
self.SideC = tkinter.StringVar() To update the side C value

Along with textvariale in Entry
self.SideC_entry = tkinter.Entry(self.SideC_frame,
                                       width=30, textvariable = self.SideC)

Then at the calc_ans part

self.Pyth =  math.sqrt(self.SideA**2 + self.SideB**2)
        
self.SideC.set(self.Pyth)
This is the object that was created and set can be called on it.

With these changes the program should run fine.

P.S:-To make it read only
self.SideC_entry.configure(state='readonly')