from tkinter import *
from tkinter import ttk

root = Tk()
root.geometry("400x400")
frame = Frame(root)
frame.pack()

temperature=0
tempUnits=0

def calculate():

    
    temperature = float(my_entry.get())
    tempUnits = Combo.get()

    if tempUnits == "Celsius":
        output.set(f"Temp {temperature}C is equal to {(temperature+273.15):.4f}F and {(temperature*1.8+32):.4f}K")
    
    if tempUnits == "Farenheit":
        output.set(f"Temp {temperature}F is equal to {(temperature-32)/1.8:.4f}C and {((temperature-32)/1.8)+273.15:.4f}K")
    
    if tempUnits == "Kelvin":
        output.set(f"Temp {temperature}K is equal to {(temperature-273.15)*1.8+32:.4f}F and {(temperature-273.15):.4f}C")






var = StringVar()
var.set("Temperature integer: ")
 
label = Label(frame, textvariable = var)
label.pack()

my_entry = Entry(frame, width = 20)
my_entry.insert(0, "")
my_entry.pack(padx = 5, pady = 5)


vlist = ["Celsius", "Farenheit", "Kelvin"]
 
Combo = ttk.Combobox(frame, values = vlist)
Combo.set("Units")
Combo.pack(padx = 5, pady = 5)


Button = Button(frame, text = "Submit", command = calculate)
Button.pack(padx = 5, pady = 5)

output = StringVar()
 
label = Label(frame, textvariable = output )
label.pack()

root.mainloop()