[Tkinter] Creating a restart button for a Pythagorean Theorem Program

[pav1983]

OK, I'm pretty sure I got all of the bugs out:
Try and let me know what you think.
This could be simplified even more, but it would start to get cryptic if so.

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import tkinter as tk from math import sqrt import sys     class PythagoreanTheorem:     def __init__(self, parent):         self.parent = parent         self.levelwidth = 400         self.levelheight = 80         self.levelxpos = 400         self.levelypos = 400         self.parent.title("Pythagorean Theorem Calculator")         self.parent.geometry("400x80")         self.parent.geometry(f"{self.levelwidth}x{self.levelheight}" \             f"+{self.levelxpos}+{self.levelypos}")            self.name = None         self.var_1 = tk.StringVar()         self.var_2 = tk.StringVar()           self.buttons = {}           self.parent.withdraw()           self.choice_frame = tk.Toplevel()         handler = lambda: self.onCloseFrame(self.choice_frame, self.query_frame)         self.add_choice_frame()           self.query_frame = tk.Toplevel()         handler = lambda: self.onCloseFrame(self.query_frame, self.results_frame)         self.add_query_frame()         self.query_frame.withdraw()           self.results_frame = tk.Toplevel()         handler = lambda: self.onCloseFrame(self.results_frame, self.choice_frame)         self.add_results_frame()         self.results_frame.withdraw()           self.choice_frame.lift()       def solve_equation(self, event, name):         self.name = name         self.e1.delete(0, 'end')         self.e2.delete(0, 'end')           if name == 'next':             self.results_frame.withdraw()             self.choice_frame.deiconify()         elif name == 'A':                        self.choice_frame.withdraw()             self.query_frame.deiconify()             self.label_1.configure(text="Value of B:")             self.label_2.configure(text="Value of C:")         elif name == 'B':             self.choice_frame.withdraw()             self.query_frame.deiconify()             self.label_1.configure(text="Value of A:")             self.label_2.configure(text="Value of C:")         elif name == 'C':             self.choice_frame.withdraw()             self.query_frame.deiconify()             self.label_1.configure(text="Value of A:")             self.label_2.configure(text="Value of B:")         else:             print(f"Unknown name {name}")             sys.exit(-1)       def onCloseFrame(self, oldframename):         oldframename.withdraw()         newframename.deconify()       def add_choice_frame(self):         self.choice_frame.title("Pythagorean Theorem Calculator")         self.choice_frame.geometry(f"{self.levelwidth}x{self.levelheight}" \             f"+{self.levelxpos}+{self.levelypos}")         self.choice_frame.protocol('WM_DELETE_WINDOW', self.quit)           self.f1 = tk.Frame(self.choice_frame, width=400, height=40)         self.f1.pack()           welcome_label = tk.Label(self.f1,             text="Welcome to the Pythagorean Theorem Calculator!", fg="blue")         welcome_label.pack()            solve_for = tk.Label(self.f1, text="Would you like to solve for A, B, or C?")         solve_for.pack()              self.f2 = tk.Frame(self.choice_frame, width=420, height=20)         self.f2.pack()           for name in ['A', 'B', 'C']:             self.buttons[name] = {}             self.buttons[name]['name'] = name             self.buttons[name]['button'] =  tk.Button(self.f2, fg="green", text=f"Solve for {name}")             self.buttons[name]['button'].bind('<Button-1>', lambda event, bname=self.buttons[name]['name']: self.solve_equation(event, bname))             self.buttons[name]['button'].pack(side=tk.LEFT)       def add_query_frame(self):         self.query_frame.title("Pythagorean Theorem Calculator")         self.query_frame.geometry(f"{self.levelwidth}x{self.levelheight}" \             f"+{self.levelxpos}+{self.levelypos}")         self.query_frame.protocol('WM_DELETE_WINDOW', self.quit)           self.label_1 = tk.Label(self.query_frame)         self.label_2 = tk.Label(self.query_frame)           self.e1 = tk.Entry(self.query_frame, textvariable=self.var_1)         self.e2 = tk.Entry(self.query_frame, textvariable=self.var_2)           self.submit_button = tk.Button(self.query_frame, text="Submit", fg="red", command=self.submit)           self.label_1.grid(row=0, sticky='w')         self.label_2.grid(row=1, sticky='w')         self.e1.grid(row=0, column=1)         self.e2.grid(row=1, column=1)         self.submit_button.grid(row=2, column=1)       def add_results_frame(self):         self.results_frame.title("Pythagorean Theorem Calculator")         self.results_frame.geometry(f"{self.levelwidth}x{self.levelheight}" \             f"+{self.levelxpos}+{self.levelypos}")         self.query_frame.protocol('WM_DELETE_WINDOW', self.quit)           self.result_label = tk.Label(self.results_frame)         self.result_label.pack()           self.next_button = tk.Button(self.results_frame, text="Next", fg="green")         self.next_button.bind('<Button-1>', lambda event, bname=self.next_button: self.solve_equation(event, 'next'))         self.next_button.pack(side=tk.LEFT)           self.quit_button = tk.Button(self.results_frame, text="Quit", fg="red", command=quit)         self.quit_button.pack(side=tk.LEFT)       def submit(self):         self.query_frame.withdraw()         self.results_frame.deiconify()         self.show_results()       def show_results(self):         name = self.name         value1 = float(self.var_1.get())         value2 = float(self.var_2.get())           if name == 'C':             result = sqrt((value1 ** 2) + (value2 ** 2))         else:             result = sqrt((value1 ** 2) - (value2 ** 2))         self.result_label.configure(text = f"The value of {name} is: {str(result)}")         def quit(self):         self.parent.destroy()         sys.exit(0)     def main():     root = tk.Tk()     pt = PythagoreanTheorem(root)     root.mainloop()      if __name__ == "__main__":     main()

You can get display dimensions using (so you can calculate display center):

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from win32api import GetSystemMetrics   Width = {GetSystemMetrics(0)} Height = {GetSystemMetrics(1)}

EDIT 10:43 PM UTC fixed error in calculation

Thanks for working with me. So far, when I go to calculate, it does not calculate the numbers and throws errors.

However, mission accomplished with those buttons.

This is a tough one. I was practically banging my head against the wall on Saturday with it. This is much harder than I thought. I don't feel bad about not being able to figure this out on my own.

[Larz60+]

it does not calculate the numbers and throws errors.

please show errors
did you see my edit at the bottom of last post? (i made a change to code)
When I run it, it works without a hitch (python 3.8.1, Linux Mint)
It the error something you can handle?

[pav1983]

Well if I could get my sides straight... ...that might help it work properly.

This is all set! It works perfectly as long as the numbers are typed in the correct spot!

Thank you so much for your help! It is greatly appreciated. I look forward to working with you on here in the near and distant future and learning more as I continue my journey with the python language.