Question

Python 3

I am trying to get my GUI Celsius to Fahrenheit calculator to work, why won't this run? let me know what to change specifically

import tkinter
import tkinter.messagebox

class GUI:
    def __int__(self):

        self.main_window=tkinter.Tk()

        self.frame1=tkinter.Frame(self.main_window)
        self.frame2=tkinter.Frame(self.main_window)
        self.frame3=tkinter.Frame(self.main_window)

        self.label1=tkinter.Label(self.frame1,text="Enter Celsius value: ")

        self.entry1=tkinter.Entry(self.frame1,width=10)

        self.label1.pack(side='left')

        self.entry1.pack(side='left')

        self.far=tkinter.StringVar()

        self.res=tkinter.Label(self.frame2,text='The Fahrenheit value is:')

        self.result=tkinter.Label(self.frame2,textvariable= self.far)

        self.res.pack(side='left')
        self.result.pack(side='left')

        self.calc=tkinter.Button(self.frame3,text='Calculate Fahrenheit',command=self.calfahr)

        self.quit_button=tkinter.Button(self.frame3,text='Quit',command=self.main_window.destroy)

        self.calc.pack(side='left')

        self.quit_button.pack(side='left')

        self.frame1.pack()
        self.frame2.pack()
        self.frame3.pack()

        tkinter.mainloop()

    def calfahr(self):
        self.test1=float(self.entry1.get())
        self.thisanswer=float((1.8*(self.test1))+32)

        self.far.set(self.thisanswer)
        
g=GUI()